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Platform Screen Doors

The 'cutting-edge' safety feature in modern subways consists of transparent doors that separate rail tracks from platforms. Train doors and platform doors are aligned and open simultaneously after the train has stopped.

Subway systems with platform screen doors (also called PSD, platform edge doors, or PED) or half-high platform gate doors (PGD) in some or all of their stations:
  1. Bangkok (Green line, Blue line)
  2. Barcelona (lines L9, L10, L11)
  3. Beijing (PGDs on lines 5, 13. PSDs on lines 8, 10)
  4. Brescia
  5. Busan (line 3)
  6. Changsha
  7. Chengdu
  8. Chongqing (PSDs in underground stations of metro and monorail lines, platform gate doors in elevated stations)
  9. Copenhagen (all underground stations)
  10. Daegu (lines 1, 2)
  11. Daejeon
  12. Dalian
  13. Delhi (Line 5, Airport Metro Express)
  14. Dubai (metro, monorail)
  15. Fukuoka
  16. Guangzhou
  17. Gwangju
  18. Hangzhou
  19. Harbin
  20. Hefei
  21. Hiroshima
  22. Hong Kong (all underground stations)
  23. Incheon
  24. Istanbul (Seyrantepe station on line M2)
  25. Kaohsiung (MRT)
  26. Kobe (Port Liner and Rokko Liner)
  27. Kuala Lumpur (KLIA line to airport, Kelana Jaya line's underground stations)
  28. Kunming
  29. Kyoto (Tozai line)
  30. Las Vegas
  31. Lausanne (Line m2)
  32. Lille (VAL, all stations)
  33. London (Jubilee Line extension)
  34. Madrid (tests in 2010, plans for 2011)
  35. Mecca
  36. Milan (line M5)
  37. Nagoya (Tobu Kyuryo maglev line)
  38. Nanjing (Line 2)
  39. Nanning
  40. Ningbo (Line 1)
  41. Osaka (all stations on the Nanko Port Town Line)
  42. Paris (lines 1, 13 (part), 14)
  43. Perugia
  44. Qingdao
  45. Rennes (VAL)
  46. Saint Petersburg (windowless steel doors in ten stations)
  47. Sao Paulo (lines 2, 3, 4 (since 2010))
  48. Seoul (lines 2 and 9, planned for all lines by 2010)
  49. Seville (Line 1)
  50. Shanghai (newer line 4 stations and refitted line 1 stations)
  51. Shenyang
  52. Shenzhen
  53. Singapore
  54. Suzhou
  55. Taipei (PGDs in the busier MRT stations, PSDs in all VAL stations)
  56. Tianjin (platform gate doors)
  57. Tokyo (Marunouchi, Mita, Namboku, Yurakucho, Yurikamome lines)
  58. Toulouse (VAL)
  59. Turin (VAL)
  60. Wuhan
  61. Wuxi
  62. Xian
  63. Yokohama (Kanazawa Seaside LRT line)
  64. Zhengzhou

Benefits of PSDs:
  • Preventing people from falling or jumping on the tracks,
  • allowing trains to enter the stations at higher speed,
  • reducing draught and air pressure caused by trains,
  • letting platforms be quieter and cleaner,
  • in hot climate, allowing the stations to be air-conditioned at lower cost,
  • preventing people from throwing trash on the tracks and thus preventing track fires.
So PSDs can increase passenger comfort and average train speed, though PSDs usually need more time to open and close than ordinary doors. In an emergency they can be opened manually from both sides. Video of Hong Kong's Tung Chun station PSDs.

Less common are chest-high or waist-high platform gate doors like those on Hong Kong's MTR Disneyland Resort Line and Tokyo's Disneyland Monorail as well as in some stations in Paris and Taipei.

Singapore MRT was the first real subway system to introduce PSDs in 1987, with its inauguration. PSDs are often being built in new subway stations but can also be retrofitted in existing stations. In addition to the subway systems listed above, platform screen doors are found in most people movers (e.g. at airports) and monorails.

Saint Petersburg has ten stations with a unique feature: platform steel doors, not screen doors (see video). The stations were built between 1961 and 1972. Contrary to common belief, the reason for the introduction of steel doors was not to prevent flooding. The reason was to lower the costs of station construction when using tunnel boring machines. When tunnel boring machines (TBM) are used, station vaults normally are constructed to have a wider profile than the TBM to host part of the platform, which requires expensive manual digging. But those Saint Petersburg stations each consist of two tunnels with the narrow profile of the TBM and a larger station vault in between. The walls between the track tunnels and the vault carry all the weight of the ceiling and allow only for narrow openings. These openings had to be covered with sliding doors for safety reasons. This makes Saint Petersburg actually the world's first metro with platform doors ("horizontal elevator"), though they are not made of glass.

London is planning to install platform screen doors on four lines, together with automated train operation: on Bakerloo, Central, Piccadilly, and Waterloo & City lines.


Hong Kong

Sunny Bay station. Hong Kong has platform screen doors in all underground stations. However, the Disneyland Resort Line is equipped with chest-high platform gate doors (PGDs).


Porte de Valenciennes elevated station.


Canary Wharf station, Jubilee Line Extension.


Canary Wharf station, Jubilee Line Extension.


Saint-Lazare station, line 14 (Météor).

Photos by Mike Rohde. Page updated 23 August 2014 (database entries may be more recent).


SkyscraperCity: Cities with platform screen doors (forum discussion).
Westinghouse: (a manufacturer of platform screen doors).
Wikipedia: Platform screen doors.

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