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automatic couplerclick to hear

Device on each end of a locomotive or car for attaching it to another locomotive or car.
automatic coupler coupler knuckle coupler knuckle pin

coupler knuckle click to hear

Articulated component that interlocks with the corresponding part on another car or locomotive.

coupler knuckle pin click to hear

Part around which the coupler knuckle pivots to open and uncouple.