{{Other uses|Headstock (disambiguation)}} [[File:Lokomotive 85007 22.jpg|thumb|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'''.<ref name=rtwp>{{cite web|title=Glossary|url=http://www.railway-technical.com/newglos.shtml#H|work=Railway Technical Web Pages|access-date=29 August 2012|url-status=dead|archive-url=https://web.archive.org/web/20141007220720/http://www.railway-technical.com/newglos.shtml#H|archive-date=7 October 2014}}</ref> 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 ==
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).<ref name=ellis>{{cite book|last=Ellis|first=Iain|title=Ellis' British Railway Engineering Encyclopaedia|year=2006|publisher=Lulu.com|location=Raleigh, North Carolina|isbn=1847286437|url=https://books.google.com/books?id=zkDYawSkRpAC&q=length+over+headstocks&pg=PA196|page=196}}</ref> Alternative expressions for length over headstocks are '''length over coupler pulling faces''', usually applied to Janney couplers, and '''length over buffers'''.
== See also == {{portal|Trains}} {{div col|colwidth=30em}} * Anticlimber * Buff strength * Bumper * Crashworthiness * Glossary of rail transport terms * Glossary of steam locomotive components * Pilot (locomotive attachment) (cowcatcher) {{div col end}}
== References == {{reflist}}
Category:Locomotive parts Category:Rolling stock
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