Automatic platform gate

Automatic platform gates (or half-height platform screen doors as referred to by some manufacturers) are chest-height sliding doors at the edge of railway platforms to prevent passengers from falling off the platform edge onto the railway tracks. Like full-height platform screen doors, these platform gates slide open or close simultaneously with the train doors.

Half-height platform gates are cheaper to install than platform screen doors, which require more metallic framework for support. Some railway operators may therefore prefer such an option to improve safety at railway platforms and, at the same time, keep costs low and non-air-conditioned platforms naturally ventilated. However, these gates are less effective than full platform screen doors in preventing people from intentionally jumping onto the tracks.

These gates were first in practical use by Hong Kong metro system, MTR on Disneyland Resort Line for their open-air stations design. The later design by other manufacturers, such as Manusa or Gilgen Door Systems AG, have their gates higher than the one installed on Disneyland Resort Line.

Examples 

A few examples include:
 Beijing Subway
 Chennai Metro
 Paris Métro
 Mass Rapid Transit (Singapore)
 MTR
 Fukuoka City Subway
 Osaka Metro
 All stations: Sennnichimae, Nagahori Tsurumi-ryokuchi, and Imazatosuji lines. The Midosuji and Chuo lines are to be fully outfitted by the end of FY 2024 in time for Expo 2025.
 Some stations: Midosuji Line (Shinsaibashi and Tennoji); Higashi-Umeda on the Tanimachi Line and Sakaisuji-Hommachi on the Sakaisuji Line are slated for installation during FY 2019.
 Nagoya Municipal Subway
 JR East, Seibu, Tokyu, Tobu, Tokyo Monorail, Tokyo Metro, and Toei
 Taipei Metro
 Shanghai Metro
 Rapid KL
 Guangzhou Metro
 Bangkok MRT
 BTS Skytrain

References 

Category:Rapid transit
Category:Railway platforms
Category:Doors