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IN

DEGREE PROJECT THE BUILT ENVIRONMENT, SECOND CYCLE, 15 CREDITS

,

STOCKHOLM SWEDEN 2018

Urban movers – elevated

railway structures and urban

life

HANS VILJOEN

KTH ROYAL INSTITUTE OF TECHNOLOGY

SCHOOL OF ARCHITECTURE AND THE BUILT ENVIRONMENT

TRITA TRITA-ABE-MBT-18414

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urban movERS

ELEVATED RAILWAY STRUCTURES

AND URBAN LIFE

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URBAN MOV

ERS

ELEVATED RAILWAY STRUCTURES AND URBAN LIFE

First published in 2018. written by Hans Viljoen. contact: hnsvljn@gmail.com Final presentation: 07.06.2018 Examiner: Tigran Haas Supervisor: Ryan Locke

AG218X Degree Project in Urban Studies, Second Cycle 15.0 credits

Master’s Programme in Urbanism Studies, 60.0 credits School of Architecture and the Built Environment KTH Royal Institute of Technology

Stockholm, Sweden

Telephone: +46 8 790 60 00

index

abstract

Cover image. ‘Drone views of Long Bien Bridge’, (Phillipe Lé, 2014)

Elevated railway structures (ERS) has for more than a century been evolving as an urban archetype. Pre-sent in various forms in cities across the globe, to transport the increasing number of citizens, ERS are urban in-frastructures that perform a vital role in curbing congestion and pollution that plague cities so often. In spite of their sustainable transport benefits, ERS are often viewed negatively as noisy, ugly and severing urban form, amongst other problems which will be elaborated on - problematising ERS. A theorisation of these prob-lems follows, looking at ERS as an

1. BACKGROUND 2. PROBLEMATISING ERS 3. THEORISING ERS 4. POTENTIALISING ERS 5. CONCLUSION 6. REFERENCES 7. PICTURE CREDITS urban type, an infrastructural type

and other typologies. 39 types of ERS interventions are described as the result of a global literary and ex-periential search of various instances of ERS and projects that seek their urban integration. It is a search for the potentials of ERS to contribute to urban life and urban form, beyond their main transport function - po-tentializing ERS.

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FIELD SKETCH - ARRIVING IN ASIA (BANGKOK & HANOI)

Having set foot in Asia for the first time, my first experience outside one of the Bangkok airports, (after a quick encounter with the tropical, humid heat outside one of the exits) is the BTS skytrain ride into the city. At first perplexed by the queue that formed at the station, I would later come to understand that the density of people in this city requires such choreography. The air-conditioned train is a relief against the heat and I am surprised that despite this heat, there is no smell of sweat. The name Ratchapraprop sounds familiar and I head there, later doubting my memory, I got off at a station, I bat-tle myself and my luggage through the densely peopled train. Again the heat and a crowd of people at each point along the platform where the train doors will open. I am anxious about the entry squeeze and real-ize that I might have to wait for the second train to come. The view from the elevated station allows one to see across this part of the city with plenty trees and tall buildings. After a ramped exchange from one station to another, I get down to the street

background

New elevated railway in Hao Nam, Hanoi, Vietnam. Author 2018.

where I am immersed in the reality of Bangkok traffic beneath the railway - a fast flow of motorbikes, cars, buses, trucks and pedestrians confined to narrow sidewalks shared with ven-dors and parked bikes. The pres-ence of the concrete elevated railway structures are overhead are an inte-gral part of the image of Bangkok’s urbanity and experience.

HANOI METRO

It was in Hao Nam (a wide double street in Dong Da, Hanoi), amidst many music instrument shops, the Vietnam National Academy of Music and the Vi-etnam National Institute of Culture and Art Studies, that I first encountered the elevated structure of the Hanoi Metro (Line 2A, near La Thanh station). Large concrete columns rise from rubbled traf-fic islands to carry the heavy concrete beams, tracks and eventually trains with commuters above. These traffic islands - post-construction sites - will likely be filled with plants. However, especially within this arts and cultural context, could the Hanoi Metro structures not become something more? Could the context around the metro lines not in-fluence and differentiate the relentless sameness of these metro structures?

The Hanoi Metro is currently under construction. Eight routes are planned, of which the first line is scheduled to open in November 2018. (Hanoimetro n.d.) Construc-tion on a second line is well un-derway and this line is scheduled to open in 2021. The system is an elevated rail system. Most people in Hanoi currently get around using motorcycles. There are around five million motorcycles on the roads of Hanoi, causing heavy traffic conges-tion and polluconges-tion at times. The de-partment of transport wants to ban motorcycles and scooters by 2030. It aims to do so with the introduction of a BRT system and the new Hanoi Metro (Hodal 2017).

Although the metro system should free-up schedules, provide safe, quiet and cool transport to those who can af-ford to use the metro, this system also in a sense restricts movement along the lines it operates. Together with the proposed ban on motorcycles, it will also impose on Hanoians’ freedom of movement. When considering urban development, land and housing costs, etc. the metro is also likely to inflate the cost of owning and renting space around its stations, as it happened in other cities like Bangkok.

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elevated railway structures

Within existing research, ERS are problematized in various modes: land-scapes with a negative effect on the image of the city (Hormigo & Mori-to 2004), residual or left-over spaces (Qamaruz-Zaman, et al 2013; Shi 2016), mono-functionality (Gabrielle et al 2016), urban segregation (Jensen 2007; Karis 2017)

problem 1 - Un-architectural infra-structure

Infrastructures are often engi-neered and planned with a purely functional purpose. This limits the po-tential of urban structures to contrib-ute to the positive image of the city and to support several forms of urban life. Elevated railway structures are usually very visible structures but very seldom-ly designed architecturalseldom-ly - to produce aesthetic effects. There are exceptions, like the ERS in Vienna and Berlin that were in a sense designed like linear buildings.

Temtem’s article (Temtem 2017) aims to decipher the urban design strategies that were used in the de-sign of the Berlin Stadbahn railway viaduct in Berlin. He sets out to find the value that architecture adds to this ‘building-viaduct’, where the role of ar-chitects in infrastructural projects are usually obscure.

problem 2 - Neglected / residual / left-over spaces

Elevated railway structures by be-ing separated from the ground, allow for a free-flow of trains without in-terruption by traffic on the ground. They also span across b o u n d a -ries like rivers and valleys or existing roads, rails and highways. The spaces beneath these elevated structures are however often neglected, left-over and residual that could be utilized by citi-zens. A study of left-over space beneath two flyovers in Kuala Lumpur was conducted in 2013 (Qamaruz-Zaman, et al). The researchers found various activities occurring here, at different times of day. They observe informal activities such as food stalls, cafes, sports and recreational activities (in-cluding chess playing, carom and ping pong), businesses and services (eg. toys and clothes stalls, as well as movers, a car wash and workshop services), a bi-weekly evening market with fresh food. Cultural activities included traditional performances with traditional musical instruments. (Qamaruz-Zaman, et al 2013:96-101)

Hormigo and Morita did a study of left-over spaces in Tokyo. They invent-ed a term for such spaces. Gapspaces are defined as spaces that emerged from density-increasing processes in urban

areas were space is limited. For growth to take place in the same geographic area, activities need to happen at dif-ferent heights or at difdif-ferent times. The infrastructures that perform this dis-tinction cause functional separations and spatial interruptions in their sur-roundings. Gapspaces interrupt con-tinuity, either spatially, temporally or functionally. Gapscapes, in turn, are the landscapes consisting of gapspac-es. (Hormigo & Morita 2004:182). The authors construed a typology of 16 types along the JR Yamanote line in Tokyo. These types considered per-meability and interactivity between gapscapes and the city (Hormigo & Morita 2004:185-187). A detailed re-view of these typologies will follow in the following section.

problem 3 - Mono-functionality Elevated railway structures are most often designed for a single pur-pose only - for transport. If other ac-tivities occur around these structures, these are usually unplanned for, and emergent.

A paper delivered at the World Congress on Railway Research, held Milan in 2016 (Gabrielle et al 2016) investigates how functional diversity could be incorporated into the design of elevated transit structures by

de-problematising

signing viaducts simultaneously with the spaces beneath them. The authors analyse theoretical urban planning approaches; they apply the concept of mixed-use development to elevated transport infrastructures by defining criteria for functional diversity and apply these criteria to three projects. (Gabrielle et al 2016:2). The criteria: 1) combining at least two functions at the same place; 2) physical integration, 3) functional integration, 4) construction according to a coherent masterplan (Gabrielle et all 2016:4-5). They apply these criteria in a comparative analysis of three ERS renovation projects in Europe (Issy-les-Moulineaux, Zurich and Dramen). They conclude that the integration of transport infrastructure with other urban functions could bring economic returns, be of social benefit and improved urban quality. The spac-es beneath ERS should be dspac-esigned simultaneously with infrastructures in order to accommodate diverse func-tions. With functional diversity, howev-er, interested stakeholders multiply and collaboration is required for successful projects (Gabrielle et all 2016:6-7).

problem 4 - Dividing / segregating Transport systems that use elevated railways are sometimes criticised for segregating and gentrifying communi-ties and neighbourhoods. The process of their construction often require ac-quisition of land and the landowners are not necessarily fairly compensated. The cost of using the rail system also excludes people without the means to pay regularly for tickets. The Bang-kok Skyrail is one such example that was investigated by Jensen (2007) as much more than just an infrastructure project to overcome traffic congestion and pollution. The skyrail participates in urban segregation, by dividing citi-zens along lines of economic ability. Tourists and the elite tend to use this system, while poor and immigrant workers are left behind in the dark and polluted ‘tunnels’ beneath the skyrails (Jensen 2007). The way that elevated rail systems segregate is through hav-ing expensive fares only payable by some people, by increasing property values around its stations and through connections to spaces of consumption.

Research Question

The four-pronged problema-tization of elevated railway struc-tures could show the way to better urban integration of these struc-tures. The question becomes - in what ways can elevated railway structures become better inte-grated within urban contexts and become productive to urban life? What kind of interventions can remedy the problems of mono-disciplinary design, residual spac-es, mono-functionality and segre-gation in both existing ERS and the design of new ERS.

Method

1. search for a variety and multi-plicity of ways ERS can integrate with urban environments.

2. illustrate with images, descrip-tions, case studies, personal ex-periences.

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ARCHITECTURAL / URBAN TYPOLOGIES

Elevated transit structures are an urban type, similarly to how streets, plazas, parks, etc. are urban types. More specifically they are an infra-structural type, that sometimes per-form like other urban typologies - the viaduct, the bridge, the city wall, the portal, the collonade, etc.

West8’s proposal for the redevelop-ment of the Gardiner Expressway and ur-ban surrounds, declares that with building the railway and highway infrastructures, an ‘infrastructural wall’ was built. “Seem-ingly without notice, the city accumulated a thick band of infrastructures that have cumulatively created a ‘wall’ seperating city and lakefront.” (West8 et al 2013:31) They trace the historical evolution of the city wall. With the urbanization of the city wall, it has served different purposes (symbolic, ceremonial, defense) and be-came hybrid structures.

The building-viaduct.

Temtem’s article aims to decipher the urban design strategies that were used in the design of the Berlin Stad-bahn railway viaduct in Berlin. He sets out to find the value that architecture adds to this ‘building-viaduct’, where the role of architects in infrastruc-tural projects are usually obscure. The ‘building-viaduct’ of the Berlin Stadbahn is morphologically linear. Designed by architect August Orth and civil engineer, Ernst Dirksen and built between 1875 and 1882. An el-evated structure was selected to avoid conflict with existing buildings, while the sandy soil and high water table of Berlin made a subway system prob-lematic. Apart from linking peripheral areas with the centre, the project was also the urban addition of an ‘inhabit-ed arcade’. The scenic effects of a ‘well-ordered facade’ would give a new face to the public spaces of Berlin. The

pro-elevated railway structures

theorising

‘Evolution of the city gate’ (West8 et al 2013:34-35)

ject was conceived to urban theories of the time that were concerned with the urban physiognomy. In contrast, the Chicago elevated railway, with ‘plan-ning limited by an engineering vision, conceiving it as a structural bridge with nothing below, leaving an unde-termined space that became residual and useless’ (Temtem 2017:5).

What the linear building-viaduct with its well-ordered facade then achieves within its urban setting are unique streets bordered on the one side with older and more contemporary 5-6 floors Berlin buildings, and on the other with the linear archway facade of the railway. The result is a ‘kind of hy-brid conduit flanked by chains of built elements with highly uneven edges…” On the side you have the infrastructur-al model and on the other side the con-tinuity of urban blocks, formed with building facades. (Temtem 2017:10)

Le Corbusier’s first point of architecture - freeing the ground, for what?

In a conference paper, entitled ‘The Typological Burden’, Tarsha Finney cites Kenneth Frampton’s critique of a New York housing project built on pi-lotis. The ‘city on piles’ brought about a ‘typological burden’ - what would the inhabitants have done with all the space beneath the floating ‘building on piles’. Elevated Railway Structures suf-fer from a similar ‘typological burden’. By virtue of being elevated, they allow the continuity of pedestrian and vehic-ular flows beneath. However their ‘ty-pological burden’ lies in the question of what these freed-up spaces could become - how they are used, and how they form urban space. (Finney 2014)

URBAN (LANDSCAPE) INFRA-STRUCTURE

Flowscapes - spaces of flows and spaces of places

Nijhuis and Jauslin (2015) puts for-ward ‘urban landscape infrastructure’ as a design concept. As a critique of engineered infrastructures that are of-ten designed for a single purpose, ‘ur-ban landscape infrastructures’ have the potential to additionally shape urban landscapes for social and ecological benefit.

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‘Gapscape typologies’ (Horomingo & Morito 2004:187)

of ‘Flowscapes’ was developed with TU Delft. In addition to the ‘spaces of places’, urban landscapes consist of ‘spaces of flows’. Urban landscapes are complex and dynamic systems with various elements and processes in in-teraction. ‘Flowscapes’ are “the formal expression of structures for the (1) pro-vision of food, energy, and fresh water; (2) support for transportation, produc-tion, nutrient recycling; (3) social ser-vices such as recreation, health, arts; and (4) regulation of climate, floods and waste water.” Spaces of flows are emerging as a new field and design dis-cipline. (Nijhuis and Jauslin 2015:24)

Nijhuis and Jauslin considers three potential fields where urban landscape infrastructure could operate: 1) trans-port landscape infrastructures, 2) green landscape infrastructures and 3) water landscape infrastructures (Nijhuis and Jauslin 2015:26-30). Relevant to the present paper, the field of transport landscape infrastructure design in-cludes various modes of transportation, energy, waste and information systems. When these functional infrastructures are viewed as ‘urban landscape infra-structures’ they have the potential to integrate technical, aesthetic and social values into multi-use designs that cre-ate new forms of public space. (Nijhuis and Jauslin 2015:26).

Gapspaces and gapscapes

Hormigo & Morito (2004), in analyzing Tokyo’s JR Yamanote line, discovered 16 types of spaces beneath the elevated railway line. They ana-lyzed spaces beneath according to per-meability, accessibility and interactions and occupations. Broadly four catego-ries of spaces were identified: spaces with restricted physical access, single-unit permeable or occupied spaces, wider permeable and interactive spaces and complex plaza-like spaces.

A1 - embankment

A2-B3 - occupation single units A2- one-sided access

A3- double-sided access

B1-B3 - fencing. visual permeability, restricted access

C1-E3 - wider gapspaces. double or multi-functional occupation. arcade-like thoroughfares. allow for interaction. D1-E3 - passages

D1 - tunnel

D2-D3 - shops, functional anchor D4 - narrow alley between shops D3-D5 -small plazas or crossings beneath. E1-E3 - complex combinations of voids and occupied spaces beneath ERS. blend with surrounds, urban continuity.

ELEVATED RAILWAY STATION TYPOLOGIES

A study by Loukaitou-Sideris et al. (2013:331), looked at a number of dif-ferent station typologies. Elevated rail-way stations are difficult to physically integrate with their surrounding urban contexts. The study was conducted along the Green and Gold elevated rail-way lines in Los Angeles, USA. They looked at the 14 elevated railway sta-tions and came up with challenges and remedies for better urban integration of these stations.

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Table 2.Summary of urban design interventions

Advantages Disadvantages Costs Land Required Density

Bridge Viaduct Path Below Viaduct Path Above

Side Access Full Knot Ar chitectural Inter ventions -Access to surrounding uses. -Increased density; Increasing ridership. -Opportunities for real estate development

-Cost of building development over existing infrastructure. -Large amount land required. -Noise

-High -High -High

-High -Development offers

access only from one side. -Access to surrounding uses. -Increased density; Increasing ridership. -Opportunities for real estate development.

-Medium to High -Medium to High

-Opportunities for real estate development. -Access to surrounding uses.

-Variations in scale. -Low capital needed.

-Low to Medium -Low to Medium -Low

-Excessive

nolse/vibrations from rail -Height limit (one or two levels)

-Low to Medium -Low to High -Low

-Can become expensive depending on its knitting with surrounding infrastructure. -Use of station air rights.

-Less land needed. -Access to surrounding uses.

-Low to Medium

-Medium to High -High -Can span greater

distances with less land for anchoring. -Access to surrounding uses.

-Limited to already dense site area.

New Paths Underspaces Layered Ground Landscape Inter ventions Per ceptual Links Mobile Urbanism

-Medium -Medium to High -Medium -Access to surrounding

uses.

-Span over wider set of Infrastructure. -Connect various land uses (public space,parks,

amenities)--Significant land needed. -Significant building support needed. -Low to High -Low -Low -Access to surrounding uses. -Low cost and maintanance.

-Noise associated with rail operations.

-Medium -Low -Low to High -Noise.

-Access to surrounding uses.

-Low construction costs. -Versatility in connecting segregated amenities. -Low to High -Low -Low -Flexibility in development location. -Versatility in serving multiple stations. -Temporary service possible. -Low cost for implementation.

-Stationary wagon could block main rail line. -Secondary tracks needed for extended parking periods or significant distances from station. -Maintenance needed. -Low to High -Low -Low -Versatile in covering

complex urban fabrics. -Low cost for implementation. -Potential misreading of markers as a cohcrent entity. -Limited capacity to promote development. Up in the Air 321

Extract from ‘Summary of urban design interventions’ in Loukaitou-Sideris et al. 2013)

Architectural interventions: 1) Full knot. The station is envel-oped within a building that houses various functions, while different levels are accesssed from within the building.

2) Side access. Similar to the Full knot, but the building is only on one side of the station, requiring less available land.

3) Viaduct (path below). Making use of the spaces beneath elevated rail-ways for other activities, outside or in built structures.

4) Viaduct (path above). Utilizing the space above elevated stations, this strategy doesn’t fully enclose the sta-tion, but wraps above and beside the station, requiring less urban land.

5) Bridge. This type of interven-tion spans over transport infrastruc-ture (typically where these are located beneath street-level). (Loukaitou-Sid-eris et al. 2013:320-324)

Landscape interventions: 1) ‘Layered ground’ accommo-dates landscapes on a new plane con-structed over transport infrastructure.

2) ‘Underspace’ converts spaces be-neath urban infrastructures into land-scapes for recreational or other uses.

3) ‘New Paths’ form new, mostly non-motorized connections between areas that were divided by transport infrastructures. (Loukaitou-Sideris et al. 2013:324-326)

Architectural and landscape inter-ventions require enough land and capi-tal in order to realize, there are more modest types of interventions that could be implemented with less land and capital available:

Mobile urbanisms:

1) ‘Remote urbanism’ fits new programs or events into railway car-riages - a mobile museum.

2) ‘Off-site nodes’ connect plat-forms in various ways (foot and bicycle bridges, moving sidewalks, shuttles, escalators, etc) to other places.

Perceptual links:

1) ‘Nodal Networks’ use wayfind-ing markers that define paths that link places within a large urban scale.

2) ‘Priviledged Path’ uses recur-ring markers to show the route to sta-tions.

3) ‘Urban Narratives’ connect stations to each other and to their sur-rounding neighbourhoods, using visu-al graphics or art that ‘tell stories’.

4) ‘Graphic connections’ - 5) ‘Perceptual Stimuli’ or the

‘Elevated railway station inter-ventions’ Loukaitou-Sideris et al. 2013:321)

stimulation of the senses (sound, light, steam) by effects that define and con-nect spaces.

6) ‘Perceptual Extension’ - archi-tectural view-framing to connect dis-connected spaces.

7) ‘Inclusive Cover’ - a net of light and graphics are used to ‘wrap’ urban infrastructure. (Loukaitou-Sideris et al. 2013:326-329)

UNDER THE ELEVATED - Design Trust for Public Space. New York, USA. 2015

A collaboration between the New York City Department of Transporta-tion and the Design Trust for Public Space undertook to study the elevat-ed highways, elevatelevat-ed railways and bridges of New York. The project was published as a book, entitled ‘Under the elevated: reclaiming space, con-necting communities’ (2015). In New York alone there is about 700 miles of elevated transportation infrastructure leaving in its shadow ‘dark, noisy and forbidding’ spaces.(Bauer et al. 2015:6) This project explored ways in which the ‘spaces under the elevated’ - or ‘el spaces’ could be developed into multi-functional public places that enrich the surrounding neighbourhoods.

Although the ‘Under the Elevated’

project is embedded in New York, it will be studied here to get insight into the methodology used; the universal typologies that emerged from inven-torying elevated transit structures and the urban strategies of improving el-spaces for public benefit.

Typical el-spaces are under juris-diction of a whole number of different actors : departments of planning, trans-portation, parks, environment, etc.

Potentials: “ecological and tech-nical infrastructure initiatives, new forms of connective public space, stra-tegically located recreational areas, and innovative models of public-private land use.” (Bauer et al. 2015:33)

El-space assets: space (the vertical dimension ranging from human-scaled to lofty urban), land (physical space and ownership), structures (architectural, sheltered space) and locations (a connect-ed network for alternate travel modes, linear public space, and environmental use). (Bauer et al. 2015:38-39)

An inventory of the 700 miles of el-evated transit structures was mapped. Typical sections were drawn and seven distinct formal types emerged from the inventory: landing, trestle, park, high-way, cluster, clover, span. Case studies were then selected to to represent each of the el-space types.

Landing - The barriers formed by

ramps, abutments, off-ramps, etc. that connect elevated structures with the ground level. Trestle - the overhead structures of the elevated railways. Park - where the elevated infrastructure run across publicly accessible or less acces-sible parkland, Highway - that often form sheltered, dark and physical and visual barriers, Cluster - the many transit systems converge, creating large footprints that divide neighbourhoods; Clover - typical massive highway clo-verleafs that leave difficult to access landscape patches; Span - bridges that span across geographic and legal boundaries offer opportunities to link. (Bauer et al. 2015:40-41)

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ramps, abutments, off-ramps, etc. that connect elevated structures with the ground level. Trestle - the overhead structures of the elevated railways. Park - where the elevated infrastructure run across publicly accessible or less acces-sible parkland, Highway - that often form sheltered, dark and physical and visual barriers, Cluster - the many transit systems converge, creating large footprints that divide neighbourhoods; Clover - typical massive highway clo-verleafs that leave difficult to access landscape patches; Span - bridges that span across geographic and legal boundaries offer opportunities to link. (Bauer et al. 2015:40-41)

In addition to the seven types, the Design Trust team also put forward an incremental phased approach to trans-forming these sites - pop-up > pilot > permanent. Low-cost, small, pop-up interventions could initiate discus-sion and workshops and gather infor-mation. After which short-term pilot projects could “test significant spatial, programmatic and operational changes under elevated infrastructure” before investments in permanent interven-tions are made. (Bauer et al. 2015:42). ‘Permanent’ improvements could then be made with evidence-based designs that are derived from communities and their contexts.

‘Greening the elevated’ - (Green Stormwater Infrastructure GSI)

The elevated transit structures of Philadelphia was studied PennDesign City and Regional Planning Studio of Fall 2016 (PennDesign 2016:22-31). The typology was arranged according to three categories - above, below and beside. “Above refers to the function of the structure, its width, frequency of use, condition, and other character-istics of the activity occurring on the structure. Below includes aspects re-lating to the environment underneath the structure, including light levels and passage through. Beside includes the environment immediately adjacent to the structure, including the land use and density of structures.” (PennDe-sign 2016:25) The study then did an analysis of elevated transit structures based on adjacent land-use, average adjacent parcel size and elevated struc-ture type. Three sites - one at a high-way, one at a freight railway and one at a passenger railway line - were selected in areas of high environmental, eco-nomic and socio-ecoeco-nomic vulnerabil-ity (PennDesign 2016:28-37). These three elevated transit sites then served as case studies for proposals to imple-ment green stormwater infrastructure, while also addressing neighbourhood

concerns. The strategies that were sug-gested for these sites included: 1) estab-lishing green corridors by linking new stormwater infrastructure adjacent to the elevated structure to a network of rain gardens, street trees and parks; 2) targeting large landowners and private land-owners to invest in stormwater retention schemes; 3) educating the public about GSI at transit stations through public art installations. SUMMARY OF THEORIES

Within this section - theorising ERS - elevated railway structures was elabo-rated on as an urban type. These struc-tures are infrastrucstruc-tures that take part in urban form, sometimes behaving like viaducts, city walls or portals. West8 et al have shown the typological evolu-tion of the city wall from ancient for-tification to contemporary hybrid types and how elevated transit structures in Toronto embody the city-wall-type. Temtem viewed ERS in Berlin as build-ing-viaducts. These hybrid structures were integrated with the urban form through facades, while accommodating additional uses in ‘inhabited arcades’. Finney exposed the ‘typological burden’ that structures on pilotis cause - what to do with the undetermined spaces between the columns. Nijhuis &

Jaus-elevated railway structures

potentialising

39 types of elevated railway structure interventions are de-scribed in this section, in the form of ‘things to do about ERS’. The result of a global literary search of various instances of ERS and projects that seek their urban integration, it is a search for the potentials of ERS to contribute to urban life and urban form, beyond their main transport function - potentializing ERS. lin critiqued engineered infrastructures

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The structures of elevated railways are great canvases for both organised and unorganised graffiti-type art. Paint pro-jects could re-animate neglected spaces and when designed in unison, they could form graphic connections or tell urban narratives (see numbers 5 and 7).

The Underground at Ink Block project in Boston invited 12 prominent artists to do murals and inaugurate a Mural Project in 2017. The murals cov-ered around 14 000 m2 of surface on

nine walls beneath a highway (Under-groundinkblock 2018).

In an effort to put the ‘jungle’ backinto the ‘concrete jungle’, there are projects that cover up the concrete structures of elevated transit structures with plants.

A project like Via Verde in Mexico City creates an image of ‘greenness’ or an ecological imperative by adding planting around the existing concrete piers of elevated transit structures.. However, at what cost? With the cost of one of these green columns, 300 trees could have be planted elsewhere. (Archdaily 2016). These ‘greening’ projects are perhaps more about the image of elevated structures in the city, and less about ecological benefit.

Reflective surfaces reflect their surroundings and as such they could have the effect of disappearance. Sean Hogan suggested such a reflective sur-face to cover the ERS in Melbourne. (Masanauskas & Carmona 2017). Early renderings of the the Davenport Grade Separation in Ontario, Canada showed reflective surfaces applied to the sides of noise barriers of new el-evated railways to reflect the surround-ing context. (Metrolinx 2016).

Paint it

Green it

Mirror it

1

2

3

There is no lack of projects that sought to liven up the spaces beneath elevated transit structures with the use of lighting. (Bill Fitz Gibbons in Bir-mingham, Alabama; Herman Kuijers did two permanent light installation for two underpases - Marstunnel and Kost-verloren - in the Dutch town, Zutpen. The lights change colour, creating visual movement through the tunnels, while pedestrians, cyclists and motorists ‘ex-perience the relationship between time and space’. (Azzarello 2015)

Ballroom Luminoso in San Anto-nia, Texas. A public art piece, entitled ‘Ballroom Luminoso’ was installed be-neath an elevated highway in San

Anto-Light it up

4

nia, Texas. Designed by Joe O’Connell and Blessing Hancock, the art work is ‘meant to thrive in the unpredictable elements of the public rather than in-side a sterile gallery”. Chandeliers were made of junk metals and bike parts and each were fitted with a bright LED light source to throw projections on the structure of the highway. The lights are switched on two hours before sun-set and a gradual change of light from natural to artificial happens during this time. The project is a result of a wider public art initiative to mark des-tinations of neighbourhood or cultur-al-historical importance. (Moret 2013)

The old railway with arches at Gam Cao, Long Bien Bridge, Hanoi. Re-cently a project was launched where Vietnamese and Korean artists painted frescoes in seventeen of these arch-ways with scenes depicting Hanoi’s 1000 years’ history. The artworks were opened in February 2018 as part of the Lunar New Year celebrations. The pro-ject was a collaboration between the People’s Committee of Hoan Kiem, the United Nations Human Settle-ments Program (UN-Habitat) and the Korea Foundation (Hanoitimes 2018).

Create urban

narratives around it

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The surfaces of elevated railway structures can become the hosts for graphic works of art. Continuity can be created through graphic consisten-cy, while differences between environ-ments and neighbourhoods can inform variation.

The Davenport Grade Separation project have invited artists to submit proposals for adorning the elevated sides. Alex McCleod have won the bid with his project ‘Secret Park Gate’. A 1.4 km long ‘mural’ - or massive 3D-rendered image - will depict six scenes in response to its urban environment (Hampton 2018).

The wayfinding strategy for the Underline project in Miami by James Corner Field Operations (2015), is closely tied to the branding and identi-ty of the Underline, forming a continu-ous graphic identity. Wayfinding are designed to encourage walking along the trail; connect to surrounding trails and neighbourhoods; encourage multi-modal transport and minimize free-standing signage. The signage provides information on ‘Where I am’, ‘Which direction am I facing’, ‘Where can I go from here’ and ‘What is around me’, completed with distances. Additional-ly, facts and information on specific ar-eas and artworks by local Miami artists are included. Signage is mostly applied directly to ERS (columns and beams) and to the bicycle and walking paths directly, minimizing the need for addi-tional structures. (James Corner Field Operations 2015:158-213)

Elevated railway structures are by nature linear and they create routes be-tween places. The spaces beneath ERS can follow their route or connect to other routes that connect green spaces, for example. These routes are marked using surface treatments or “recurring markers within a continuous infra-structure to establish and highlight a particular route or path...” (Loukaitou-Sideris et al 2013:328).

The Atlanta Beltine is an ambitious project aiming to connect parks, trails, transit and affordable housing into a loop through Atlanta, Georgia. The project originated with Ryan Gravel’s Master thesis, entitled ‘Beltline - At-lanta : design of infrastructure as a re-flection of public policy’ (1999).

Make graphic

connections

Use wayfinding

around it

Make routes

7

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Apart from all the murals done as part of the Underground Mural Pro-ject, the Underground Inkblock in Boston, MA is a space that have hosted all kind of events. There are regular fit-ness and yoga classes, dog parades or doodling days happening. The Octa-cofest combined beer, tacos and music into a festival beneath the overhead structure. (Underground at Inkblock 2018). After the success of this event, a seasonal beer garden was opened by a local brewery. Long tables, weather-resistant lounge furniture and lawn games can accommodate around 400 people. Food trucks and ‘pop-up shops’ will also be invited, providing an infor-mal trading platform. (Cain 2018). The park and event space was a combined effort between MassDOT (Massachu-setts Department of Transport) and a development company, National De-velopment.

A study of left-over space beneath two flyovers in Kuala Lumpur was conducted in 2013 (Qamaruz-Zaman, et al). The researchers found various activities occurring here, at different times of day. They observe informal activities such as food stalls, cafes, sports and recreational activities (in-cluding chess playing, carom and ping pong), businesses and services (eg. toys and clothes stalls, as well as movers, a car wash and workshop services), a bi-weekly evening market with fresh food. Cultural activities included traditional performances with traditional musical instruments. (Qamaruz-Zaman, et al 2013:96-101)

Have events beneath it

Deliver services

beneath it

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‘Das Küchenmonument’ or The Kitchen Monument by Raumlabor and Plastique Fantastique was a travelling inflatable and inhabitable sculpture that were inflated in various locations with various events occuring in it. In Duisburg it was even inflated beneath a flyover, hosting a public cooking and dining hall. (Raumlaborberlin 2016)

Inflate a bubble

beneath it

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The cover that elevated structures provide makes the spaces beneath ideal for camping out. During events or fes-tivals visitors could be accommodated here. The ‘Urban Campscape’ was such a campsite during the Dutch Design Week 2012. The space beneath a flyo-ver in Eindhoven’s Strijp-S district was converted into a campsite, providing accommodation and cultural programs such as “guerrilla gardening workshops, an exhibition about the Green Corri-dor, breakfast with products from the Philips Fruit Garden, bicycle tours…” (Knitel 2012)

The programming of railway car-riages for different purposes - eg. a mobile museum or mobile classrooms - or establishing connections between elevated railway structures and other places via bridges, ramps, escaltors etc. Loukaitou-Sideris et al (2013:326-329) call these type of measures ‘Mobile Ur-banisms’. Pictured above here are the carriages of the ‘Nomadic Railway City’ by Swedish architects Jagnefalt Milton.

Have a campsite

beneath it

‘Mobile urbanisms’

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Spaces beneath elevated railways are ideally suited for public spaces, since they are usually closeby railway stations and the cover overhead shel-ters against sun and rain or snow. Of this variety, example projects include ‘Under the viaduct’ by Renzo Piano and G124 in Rome; A8erna in Zaan-stad, Netherlands; De Hofbogen in Rotterdam; the Crossroads Project in Milwaukee, USA; the Bentway in To-ronto.

The Minhocão Marquise, a project by Triptyque Architects in São Paulo, Brasil. A transformation of 3km of the Minhocao Viaduct built in the 1970s. In addition to the plants added and stormwater retention, the project will make public space in the 33m in-be-tween spaces bein-be-tween columns. These spaces will be filled with four kinds of programs modules - culture, food, ser-vices and shops. (Triptyque 2017)

Make a public space

beneath it

15

Beneath the Bentway in Toronto, an ice skating route was installed to mark the space beneath the Gardiner Expressway as a new urban space and outdoor art gallery. (Hague, 2018)

Skate parks are popular use of space under elevated structures (Gardens station, Cape Town, South Africa; Ralambshovsparken, Stockholm, Swe-den; Burnside Skate Park, Portland, Oregon; Northbank, Melbourne, Aus-tralia; Hanespark, Stade, Germany; Heidelberger Bridge Park, Berlin, Ger-many, etc. an extensive collection is available at www.skateboard.com.au).

Scob Architecture and Landscape have designed a number of ‘Landskate parks’ in Barcelona. One of these, Skate Park Les Corts, is located beneath an elevated transit structure. The design is conceived to form a continuity between the skatepark elements, the vegetation and public space - rather than bulky, isolated elements. (Scob 2018)

Make an ice skate rink

beneath it

Make a ‘landskate

park’ beneath it

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Kosmos architects, in collaboration with Ekaterina Zavyalova, transforms the typology of the billboard with their Queensway Billboards project. Instead of advertising products, the billboards make possible vertical circulation with stairs, ramps, lifts, slides, etc. and per-form social functions such as elevated sports, vertical gardens, art spaces, cin-ema, etc. In the project, a ‘billboard’ structure is located at each of the inter-sections of a portion of the abandoned Queensway railway. (Divisare 2016)

Build ‘social billboards’

at intersections

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The High Line project in New York received a lot of press for converting a disused railway tracks into an elevated park. It should be noted that Paris ini-tiated this type of urban intervention with the Promenade Plantée, designed by architect Philippe Matthieu and landscape architect Jacques Vergely in 1988 after they won the competition for repurposing an abandoned railway as a greenway. (Heathcot 2013:285). After the High Line, a number of similar projects were launched in the USA and elsewhere: the 606 (Bloomingdale Trail) in Chicago, the RailPark (at Reading Viaduct) in Philadelphia, the St Thomas Elevated Park in Ontario, Canada, the Goods Line in Sydney, Australia. Al-though these are certainly exciting pro-jects in re-invigorating neighbourhoods and cities, the question remains - what to do about elevated railway structures that are still in use?

Barcelona didn’t wait for its rail-ways to become derelict before they added an elevated park space. The Rambla des Sants, designed by Ana Molino and Sergi Godia, added a sec-ond deck above a railway line in the Sants neighbourhood. The project aimed to ‘heal the wound’ between neighbourhoods that the railway tracks severed. The new park deck ranges from 4-12 m above the adjacent street levels and is supported on a prefab con-crete structure that recalls traditional warren beams associated with railway structures. (Landezine 2017)

Make a park on a

disused railway

Build a park above it

19

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Rambla de Sants, Barcelona, Spain. 2016. Ana Molino Sergi Godia

The Rambla de Sants project healed a portion of Barcelona that was sev-ered by train tracks. The existing train tracks were roofed with a new linear park, giving panoramic visual access along two routes - a shaded one and a sunny one. Between the two paths, an artificial topography is densely planted with shrubs and trees. Climbing plants grow along the pre-cast concrete ‘infra-structural facades’ with cable systems to guide them (Landezine 2016)

The Underline. Miami, USA. 2015. James Corner Field Operations.

The Underline Park in Miami is de-signed around seven ‘character zones’ - ‘active recreation’, ‘green tech’, ‘art & craft incubator’, and ‘nature & play’. “The Underline will have character zones that draw from the surround-ing neighborhoods and provide a var-ied experience including a number of unique programmed spaces along the way.” (James Corner FIeld operations 2015:103). Within these character zones there will also be half-mile ‘areas of intensity’ that become destinations. These include a play-focused area; an area of nature-oriented play beyond

Make a park beneath it

21

traditional playgrounds; an area of arts and crafts with outdoor galleries and connections to existing business; an area for the public to ‘create, dis-play and teach crafts that enhances the public realm’; an area that caters for the student population ‘by creating a place to hang out, with social seating, food and drink and fun recreational activities such as roller skating and skateboarding’ (JCFO 2015:128); an area with health and wellbeing themed gardens such as butterfly habitats, or healing and aromatic plants; an area for group and individual fitness - out-door workouts, soccer, frisbee, running and racing. (JCFO 2015:110-139)

By virtue of their height, ERS, cre-ate the potential for attaching things up in the air. The festive temporary hang-ing of flags or lights comes to mind, but more permanent suspensions are also possibile. Diller Scofidio + Renfro de-veloped an interesting way to have trees attaching to the sides of elevated struc-tures. The design was proposed as part of the competition entry for the rede-velopment of the Gardiner Expressway in Toronto. ‘Suspended root ball trees’ would be suspended from the concrete structure, as if lifted together with the highway. Trees are planted in round bags that fit in steel ring baskets at-tached to the concrete structure. Once the trees outgrow their bags they are transplanted to streets. (Diller, Scofid-io + Renfro 2010:8-9).

Attach trees to it

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Chieu Lieu trees (Terminalia bel-lirica) or small-leave Bang (Bucida mo-lineti) trees are being planted beneath the Cat Linh - Ha Dong line of the Hanoi urban railway. These trees are suitable for planting beneath railways when they are pruned to grow horizon-tally, instead of vertically. (Dat 2016)

In some instances the height afford-ed by ERS, allow for structures to be hung from them. The Marsupial Bridge, part of the Crossroads project in Mil-waukee, Wisconson, USA, is one such example. A bicycle lane and pedestrian track is suspended from and ‘hosted’ by the steel railway bridge above. The bridge provides a close-up experience of both the water and the steel structure above. It reconnects neighbourhoods across the river, while also becoming an attractive visual centre-piece to the Crossroads project and adding an iconic urban infrastructure to Milwaukee (La and Dallman 2009), (King 2010) (Bruner Foundation 2008)

Plant trees beneath it

Hang a pathway from it

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Radbahn, Berlin. A non-profit or-ganization, called Paper Planes, formed by eight Berliners in 2016. They want to realize a 9 km cycling track beneath the elevated structure of the U1 line in Berlin. Ancillary spaces like green spaces, recreational spaces and bike service stations will line the cycle route. (Finger 2017)

Make a bicycle path

beneath it

25

At the Koiwa station in Tokyo, bicycle parking for about 1500 bikes were built beneath the elevated railway tracks. The facility now serves the train station, a local shopping centre and the surrounding neighbourhood. (Ecosta-tion21 2006)

Stormwater and rainwater (collect, prevent flooding and filter oil, heavy metals and gases) eg. Highway Outfall Landscape Detention HOLD system in Queens (Bauer et al. 2015:33).

The ‘Greening the elevated’ pro-ject by the PennDesign studio of 2016 proposed strategies to improve spaces around elevated transit structures, mainly through the implementation of Stormwater Green Infrastructure (PennDesign 2016).

Park bicycles beneath it Filter rainwater from it

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The SGR (Standard Gauge Rail-way) is being built through Nairobi National Park in Kenya. Initially planned to run through a rhino breed-ing ground, the railway has been di-verted over grassland. Although the railway has been raised above ground by 7m to 40m to allow animals to pass, there are still concerns that the 6km railway will affect animal migra-tion patterns. (Rajab 2018). The Kenya Railways Company chose this route to avoid high land compensation costs.

Let animals pass

be-neath it

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Building beneath elevated railway structures poses limitations, in terms of dimensions and in terms of ownership, safety regulations, etc. Despite these limitations, various uses could be ac-commodated in interior spaces beneath elevated railway lines. These functions are a product of the context. MySpace Architects in Delhi did a study and found that 60% of the spaces beneath the Noida metro line could be devel-oped into functional spaces (Dovey 2017), that could include: Start-up and small scale businesses, co-working spaces, government offices, community centres and night shelters (Rethinking the future 2017)

CAATstudio made a proposal to convert the space beneath the Mirdam-ad bridge into an open-air anthropol-ogy museum for pedestrians. By cover-ing columns an acoustic space could be created. (Santos 2017; CAATstudio 2017)

Build beneath it

Build an open air

mu-suem beneath it

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The serial spatial bays beneath ERS as well as the sensitivity of site - construction would interrupt traf-fic - makes modular construction techniques ideal for building interior spaces beneath ERS. In Tokyo an en-tire nursery school was built beneath the JR Chuo Line. The ‘Global Kids Musashi-gakuen’ school was built to fit in a space of 90 x 11.5 metres, fit-ting in-between concrete piers spaced 15m apart. The school looks like a five car train, with each of the ‘cars’ con-taining a classroom. To minimize the on-site construction time, lightweight steel construction was used that could be assembled by hand on site. (Ishijima Architecture 2014)

Build modules

be-neath it

31

Interior spaces beneath railway via-ducts are often created by closing-off viaduct arches. Where-ever there is a city with viaducts there are likely parts of these viaducts that have been con-verted into shops, restaurants or other interior spaces. The Promenade Plantee in Paris, Imviadukt in Zurich, the No-lle restaurant in Berlin, the McDonalds in Vienna.

The Shimokitazawa Cage in To-kyo is a 12m x 16m cage built beneath an ERS. The space in the cage can be configured to become different kind of event spaces - theater, movie theatre, market, round stage, bazaar, ring or runway. (Keiobridge 2017:18)

Fill in the viaduct

Build an events cage

beneath it

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33

This urban type is manifested in the well-known medieval bridge,the Ponte Vecchio in Florence, Italy. This type occurs when a bridge, or elevated structure, includes a building above it.

Steven Holl designed at least two projects of the ‘inhabited bridge’ type. He curated the Pamphlet Architecture #7 issue, which included his project for a landmark in Melbourne, Australia. The Melbourne project consisted of seven inhabited bridges - or ‘urban arms’ - that extended streets over a railway and connecting these to a river - Bridge of Pools and Baths; Cultural Bridge; Bridge of Piazzas; Bridge of Ancient/Modern Columns; Bridge of International Trade; Bridge of Odd Flowers and the Bridge of Houses. The seventh bridge, the Bridge of Houses, was later adapted to a project for the disused Highline in New York - the ‘Bridge of Houses’, 1981. (Hyde 2008).

Build an inhabited

bridge

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The idea of living in a building with a railway running through it, may not sound very appealing. This was the real-ity for residents of the ‘Durchbrochenes Haus’, in Berlin, until the building was bombed during WW1. To this day the U1 line at Dennewitzstraße runs through an apartment building. (secretcitytravel 2014) The Chinese city of Qhongqing built the Libiza sta-tion on the sixth to eighth floors of an apartment building. The sound insula-tion fitted reduces the sound of trains to about the noise of a washing ma-chine. This under-exploited typology could mean continuity of urban form and facades, despite of railways passing perpendicularly through them. (Mol-loy 2017)

The Heron Quays station of the Docklands Light Railway in Canary Wharf, London (2012) is another ex-ample of this type.

The Siam Paragon shopping mall in Bangkok is directly link with bridges and plazas to the Siam Station of the Bangkok Skytrain. In August 2017 a further skywalk bridge was opened over the Pathum-Wan intersection. Case engineers and Urban Architects, designed a pedestrian link across the intersection. A plaza-like space, with colourful green tiles, umbrella-like structures and comfortable seats, was created that connects to the four cor-ner buildings and the Skytrain station. These buildings that include shopping malls and an arts center are made into side-access buildings, connected to the train station (Case 2017; Loukaitou-Sideris et al 2013).

Where there is limited space avail-able beside elevated structures, a build-ing could be built on columns or piers right above the elevated railway line. The Standard Highline hotel was built on sculptural piers to hover over the abandoned railway line and new linear High Line park. The hotel challenges traditional notions of privacy and the transparency of hotel rooms reach from both inside-out (panoramic views) and outside in (visual proximity of pedestri-ans on the high line) (Ennead, 2009).

Build a building

around it

Build a building

beside it

Build a building

above it

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Elevated railway structures are designed to accommodate other uses above, beneath or beside them. The position and spacing of columns have a definite effect on how the spaces be-neath can be used. Large concrete piers in the middle, forces movement around them, while if they are placed off-centre or if two smaller piers are used, move-ment can continue along the centre line. This aspect is especially important where there are roads on either side of the columns. A double or off-centre column configuration could add a pro-tective zone for pedestrians, cyclists, etc. from surrounding vehicular traffic. The height of horizontal elements de-termines what the spaces beneath can be used for - if high enough, two levels could be added - an open ground plane with a second enclosed level or double storey enclosures.

ERS has the potential for a con-tinuous variation or differentiation along its different lines and different stations. This could pick-up on local contextual differences, while also aid-ing way-findaid-ing and place-attachment. Why is that the metro structures look the same everywhere? An economy of scale, professional laziness, lack of am-bition? The Metamorphosis paintings of MC Escher show a gradual evolu-tion of a form or pattern. What if the metro lines gradually transform along its route through different parts of the city, mimicking the differences of den-sities and ages in its surroundings.

The typologies (or things to do with elevated railway structures) de-fined here are idealised ‘slices’ of ERS. They exist in series along rail-way lines and a whole array of these types could occur along one railway line. These types are useful in multi-plying the possible ways that ERS can aid urban integration. The application of types in the design of spaces around ERS are necessarily specific to their context - it is from here that appropriate design strategies should stem.

Design the structure

to house other uses

Design in Variation

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ERS ARE TRENDY

The last two decades have seen many projects arise that sought to improve residual urban spaces. The value of urban land has necessitated the better use of left-over space around elevated railway structures. Projects everywhere have come up with various ways to bring urban life to these resid-ual spaces. These typologies are mostly also applicable to other elevated urban structures, like highway structures. ERS ARE PART OF THE URBAN LANDSCAPE

More disciplines (urbanism, ar-chitecture, landscape, events, parks, recreation) should be involved with its design - not the exclusive domain of transport departments and engineers. ERS SHOULD BE

MULTI-FUNCTIONAL

Elevated railway structures should perform more functions than only transportation. They should also con-tribute to the city in one or more of the following ways : hosting public art, forming public spaces, forming event spaces, forming landscapes, forming recreational spaces, become integrated with building fabric (beneath, beside or above).

conclusion

ERS SHOULD INTEGRATE URBAN FABRIC

ERS don’t have to sever the urban fab-ric. With careful design (and attention to ‘gapscapes’) ERS could be designed to in-tegrate urban fabric. This could be done in various ways - graphic and perceptual links, continuity and programming of the urban ground; ‘wrapping’ new build-ings around ERS, accommodating addi-tional formal and informal uses beneath the structures, The ways to integrate ERS present themselves as types.

ERS ARE HYBRID TYPES

Elevated transport infrastructures are hybrid urban types (sometimes act-ing as city walls, portals, bridges, etc). They are also a type of ‘urban land-scape infrastructure’ that form ‘flows-capes’, performing architectural, land-scape, urban and ecological functions in addition to transportation. By pay-ing attention to the type of ‘gapspaces’ these elevated structures create, urban accessibility, permeability and interac-tion could be ensured. The 39 types of interventions have multiplied the vari-ous potential ways that ERS could be-come integrated with urban life.

EARLIER THE BETTER

Although there are numerous strategies of integrating elevated railway struc-tures within urban contexts, the physi-cal limitations of specific instances, often exclude many of these strategies, especially once the structures have al-ready been built. If in the planning and design of these structures, the prob-lems of mono-function, residual space and division are considered earlier, these structures could be better inte-grated and allow for more open-ended uses around them.

ERS IN CONTEXT

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References

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