Reversible seats in older commuter and long-distance passenger cars feature a pivoting backrest that allows passengers to face either direction of travel. The seat lock is a floor-mounted or frame-mounted mechanical catch that secures the seat assembly once it is flipped. Conductors use a specialized key to release these latches at the end of the line, allowing the crew to walk the aisle and flip all the seats for the return trip.
Heard on the job
Conductor, make sure every seat lock is engaged before we open the doors for the outbound crowd.
Insider tip
If a seat lock is jammed, kicking the base while turning the coach key usually frees the mechanism.