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A headstock of a rail vehicle is a transverse structural member located at the extreme end of the vehicle 's underframe .. rail vehicle. Railroad car. underframe. 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 .. coupling. railway coupling. buffers. Buffer ( rail transport ). The headstocks form part of the underframe of a locomotive or a railroad car .. underframe. underframe. locomotive. locomotive. railroad car. 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 .. cabcars. Control car ( rail ). headlamps. Locomotive headlamp. hoses. Hose ( tubing ). air brakes. Railway air brake. train control. Push–pull train. head end power. head end power