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automatic coupler

Device on each end of a locomotive or car for attaching it to another locomotive or car.
automatic coupler Articulated component that interlocks with the corresponding part on another car or locomotive. Part around which the coupler knuckle pivots to open and uncouple.

coupler knuckle

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

coupler knuckle pin

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