Janney coupler
Semi-automatic railroad coupler / From Wikipedia, the free encyclopedia
Janney couplers are a semi-automatic form of railway coupling that allow rail cars and locomotives to be securely linked together without rail workers having to get between the vehicles. They are also known as American, AAR, APT, ARA, MCB, knuckle, Buckeye, tightlock (in the UK) or Centre Buffer Couplers.