draw·bar /ˈdrɔˌbɑr/
列車間的掛鉤,牽引車的掛鉤
Draw·bar n. Railroad (a) An openmouthed bar at the end of a car, which receives a coupling link and pin by which the car is drawn. It is usually provided with a spring to give elasticity to the connection between the cars of a train. (b) A bar of iron with an eye at each end, or a heavy link, for coupling a locomotive to a tender or car.
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drawbar
n : a strong metal bar bearing a hook to attach something to be
pulled