8.4 Sliding doors at platforms

This measure consists of the installation of a flexible system of sliding panels on the whole length of the platform’s edge. The system usually looks like a glass wall with intermittent "elevator type doors" and is often labelled “platform screen doors” (PSDs), “platform gate doors” (PGDs) or “platform-edge barriers”. The doors are normally closed and open only after the train had entered the station and stopped thus allowing passengers to get on/off the train. The system can be full-height (FHPSD  ) or half-height (HHPSD  ).
  • Try to fit the people’s movement pattern and station environment with the right height and shape of the doors.
  • Combine with warning or informative signs posted in visible places on the sliding doors.
  • Implementation may be difficult because of many different train types wherein the doors will be located at another section.
  • The failure rate for doors not opening has to be as low as 0.1% because otherwise there will be a disruption of the logistic process when people try to leave the train.
  • Link between platform doors/screen at platform edge and type of rolling stock/control systems. OK if only dedicated rolling stock which could limit potential applications - costly.
  • Expensive to install and limited, in the main, to stations constructed in tunnels.
  • This measure became very popular in underground systems especially since the introduction of the automated lines (trains with no driver). An extensive list of examples is provided here.
  • In some metro systems it was implemented only as a mandatory standard for automated trains and for traffic regulation purposes. Yet, once installed it virtually eliminated suicide and trespassing incidents.
  • PSD   effectively prevented suicides at railway station platforms with no significant sign of displacement to other platforms (Law et al., 2009): railway suicides decreased by 59% since the installation of platform screen door, adjusted for age and gender. No sign of suicide substitution to unsealed platforms. Railway suicides decreased by 84% for people with psychiatric profile.
  • PSD   was effective in preventing falls onto railway tracks in Hong Kong. They effectively reduced railway injuries (adjusted 5-year average percentage change: -68.8%) with no apparent substitution effect to the other platforms observed (Law & Yip, 2011).

last update: 2015-01-29 Print