Headshunt

File:Passing Loop.png

A diagram of a passing loop showing the headshunt on the left

A headshunt (also called an escape track in American practice) is a a short length of track that allows a locomotive to uncouple from its train and run past it. Headshunts may be used at a terminal station to allow the locomotive to switch to the opposite end of its train using a 'run-round loop', so the train can be hauled out of the station in the other direction.

Headshunt may also refer to a short length of track that runs parallel to the main line and which allows a train to shunt between a group of sidings without occupying the main running line.