The Scharfenberg coupler is a commonly used type of fully automatic railway coupling.
Scharfenberg coupler on ICE 3 EMU
Scharfenberg coupler on a NCTD Sprinter Siemens Desiro VT642 DMU at Escondido Transit Center
Type 10 as used on TGV
The Shanghai Metro is among several metro systems that use the Type 35 Scharfenberg coupler
A coupling or coupler is a mechanism, typically located at each end of a rail vehicle, that connects them together to form a train. The equipment that connects the couplers to the vehicles is the draft gear or draw gear, which must absorb the stresses of the coupling and the acceleration of the train.
Scharfenberg coupler on a Southeastern Class 395
Three-link coupling on an antique tank wagon
UIC standard screw coupling, shown attached and tightened
A link-and-pin coupler