A dragbox (also ''drag-box'' or ''drag box'') is a substantial, often cast metal, part of a locomotive to which the coupling mechanism is attached to allow the
locomotive
A locomotive is a rail transport, rail vehicle that provides the motive power for a train. Traditionally, locomotives pulled trains from the front. However, Push–pull train, push–pull operation has become common, and in the pursuit for ...
to pull a train.
[Ransome-Wallis, Patrick (1959)''The Concise Encyclopedia of World Railway Locomotives'', Hawthorn Books]
References
Locomotive parts
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