Tightlock coupling
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Type H Tightlock couplers are a variety of Janney coupler, typically used on North American mainline passenger rail cars. They have mechanical features that reduce slack in normal operation and prevent telescoping in derailments, yet remain compatible with other Janney types used by North American freight railroads.
Type H Tightlock couplers on a California Car cab car with separate air brake and head end power connections
Type H Tightlock couplers on an MBTA cab car with separate air brake and head end power connections
Type H Tightlock couplers on a Networker EMU with integral air brake and head end power connections
Type H Tightlock couplers on a British Rail Class 321 EMU with integral air brake and head end power connections
Janney coupler
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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 or Centre Buffer Couplers.
Syracuse Malleable Iron Works – 1894. MCB5 Transition Coupler, compatible with link and pin coupling
MCB Type 5 coupler circa 1893. Split knuckle accommodates link and pin coupler or Johnston coupler. Vertical hole in knuckle accommodates the pin. Could also have accommodated a buffers and chain coupler with an extra pin.
AAR Type F Interlock couplers, rigid version at right and rotary version at left. The one on the left lost its pin and was pulled out of its coupler pocket.
Mated Janney Type E couplers, as seen from above. Left is top-operated on locomotives. Right is bottom-operated on cars