Buffer stop

Buffer stop

A buffer stop or bumper (US) is a device to prevent railway vehicles from going past the end of a section of track.

The design of the buffer stop is dependent in part upon the kind of couplings that the railway uses, since the coupling gear is the first part of the vehicle that the buffer stop touches. The term buffer stop is itself of British origin, railways in Great Britain principally using buffer-and-screw couplings between vehicles.

Energy-absorbing buffer stops

The large mass of a train, even at low speed, transfers a large amount of energy in a collision with a buffer stop. Ordinary buffer stops cannot cope. What is needed is some way of dissipating this energy, as through hydraulics or friction. Following a buffer stop accident at Frankfurt-am-Main in 1902, the Rawie company developed a large range of energy-absorbing buffer stops. Similar hydraulic buffer stops were developed by Ransomes & Rapier in the UK.


Lower cost alternatives to a buffer stop include railroad ties fixed to the rails, or a pile of dirt.

Warning lights

Buffer stops often have a fixed red light associated with them.


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