Headstock (rolling stock)

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(Redirected from Buffer beam)
Buffer beam / headstock (painted red) fitted with buffers and chain coupler and air hoses on the front end of a German steam locomotive

A headstock of a rail vehicle is a transverse structural member located at the extreme end of the vehicle's underframe. The headstock supports the coupling at that end of the vehicle, and may also support buffers, in which case it may also be known as a buffer beam.[1] The headstocks form part of the underframe of a locomotive or a railroad car. The headstocks of locomotives, railcars and cabcars also support headlamps and the hoses for air brakes, vacuum brakes as well as the cables for train control and head end power.

Length over headstocks[edit]

A commonly used measurement relating to a rail vehicle is its length over headstocks, which is the length of the vehicle excluding its couplings or buffers (if any).[2] Alternative expressions for length over headstocks are length over coupler pulling faces, usually applied to Janney couplers, and length over buffers.

See also[edit]


  1. ^ "Glossary". Railway Technical Web Pages. Railway Technical Web Pages. Archived from the original on 7 October 2014. Retrieved 29 August 2012.
  2. ^ Ellis, Iain (2006). Ellis' British Railway Engineering Encyclopaedia. Raleigh, North Carolina: Lulu.com. p. 196. ISBN 1847286437.