Platform Screen Doors

A safety barrier (also called PSD, platform edge doors or PED) separates rail tracks from platforms. Train doors and platform doors are aligned and open simultaneously after the train has stopped at a predefined position.

Subway systems with platform screen doors in some or all of their stations:

Bangkok
Barcelona (under construction on lines 5, 11, planned for lines 9, 10)
Beijing (platform gate doors on line 5's underground stations)
Copenhagen (all underground stations)
Daejeon
Fukuoka
Guangzhou
Gwangju
Hong Kong (all underground stations)
Kaohsiung MRT (under construction)
Kobe (Port Liner and Rokko Liner)
Kuala Lumpur (Kelana Jaya line's underground stations, KLIA Ekspres line to airport)
Kyoto (Tozai line)
Las Vegas
Lille VAL (all stations)
London (Jubilee Line extension)
New York City (planned for the new Second Avenue Line)
Osaka (all stations on the Nanko Port Town Line)
Paris (all stations of line 14)
Rennes VAL
Seoul (under construction for lines 2, 9)
Shanghai (new line 4 stations and refitting of line 1)
Shenzhen
Singapore
St Petersburg (windowless steel doors in a few stations)
Taipei MRT (Muzha line VAL)
Tokyo (Marunouchi, Mita, Namboku, Yurikamome lines)
Toulouse VAL
Turin VAL
Yokohama (Kanazawa Seaside LRT line)

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.

PSDs can thus 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.

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

Less common are chest-high or waist-high barriers (platform gate doors or PGDs) 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.

St. Petersburg has windowless steel doors in a few stations to avoid flooding of the stations. Video.

	Copenhagen
	Hong Kong Sunny Bay station. Hong Kong has platform screen doors in all underground stations. However, two stations are equipped with chest-high platform gate doors (PGDs).
	Lille Porte de Valenciennes elevated station.
	London Canary Wharf station, Jubilee Line Extension.
	London Canary Wharf station, Jubilee Line Extension.
	Paris Saint-Lazare station, line 14 (Météor).

Photos by M. Rohde. Page updated 13 October 2007.
Anything missing? Please go to the Metro Bits Forum. Thanks to those who contributed.

Reference

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

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Platform Screen Doors

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Reference