A Detrainment device is equipment on a rail vehicle that provides an evacuation route for the passengers. It usually consists of a set of steps or a ramp, located at a doorway, allowing passengers to leave the vehicle in an emergency, vehicle breakdown or accident.
A detrainment device is moved from a stored location into an operational position, usually above the coupler at the end of a passenger car. A detrainment device may consist of a manually placed, hinged, foldable or telescopic ladder or ramp. A detrainment device may allow evacuation to track level, or to a coupled railcar. A detrainment device may be fitted with handrails.
In other cases, evacuation may be via the vehicle passenger side doors to a trackside walkway in a tunnel, without the use of a detrainment device.
Detrainment device Wikipedia
Examples of the main types of detrainment device currently in service include:
a) Steps, stored loose inside the driver’s cab or the passenger saloonHistorically the most common arrangement
b) Hinged steps, stored inside the driver’s cab or the passenger saloonLondon Underground S Stock
c) Steps, folding, hinging or sliding out from the doorwayLondon Underground 1973 Stock (refurbished)
London Underground 1996 Stock
British Rail Class 378
d) Ramp, sliding out from below the doorwayLondon Underground 1992 Stock
Manila LRT Line 2 Stock
e) Ramp, folding out from the doorwayMTR Metro Cammell EMU
MTR Metro Cammell EMU (Disneyland Resort Line) stock
Kawasaki Heavy Industries C151, Siemens C651, Kawasaki Heavy Industries & Nippon Sharyo C751B, Kawasaki Heavy Industries & CSR Sifang C151A
Delhi Metro RS2 and RS3
Alstom Metropolis C751A – North East Line
PNR 203 Series EMU, Khia 52 Trains, JR 12/14 Series (Ladder Only)
Hyundai-Rotem MTR K-Stock EMU
Kaohsiung Mass Rapid Transit
MTR Corporation -MTR Corporation C-Train EMU
f) Tensioned Fabric ramp, deploying from the doorwayMTR Corporation Airport Express A-Stock EMU
Siemens Modular Metro and Bombardier Changchun Coaches – Bangkok BTS Skytrain
KTM Train Coaches (even Tiger Trains)
Bombardier MOVIA C951 - Downtown Line
Alstom Metropolis C830 – Circle Line
Alstom Metropolis Barcelona Metro line 9
User trials on prototype equipment in controlled conditions have indicated that a wide detrainment ramp will allow the evacuation of 2500 passengers in 28 minutes if the ramp, its handrails and the cab and saloon throughways are correctly specified. Modern detrainment step systems can detrain one person every two seconds.