Operating close coupler with single-conductor electrical connection for lighted express train passenger cars. These couplers are also suitable for locomotives and cars with a lower buffer height in accordance with NEM 303. These couplers go with cars ready for their installation with car lengths of 26.4 cm / 10-3/8", 27 cm / 10-5/8", and 28.2 cm / 11-1/8" when installing 73400/73401 interior lighting. One car in the train consist needs a 73404, 73405, or 73406 pickup shoe. Contents: 2 close coupler heads for standard coupler pockets with contacts, 2 sets of contacts for coupler drawbars, 1 ground spring for the truck, 2 connecting wires, and installation instructions. Reliable operation connection with snap-in contacts. Coupling and uncoupling on the layout can be done manually. Coupling with regular close couplers without an electrical contact can also be done.