Selective door operation

In the UK various trains, either multiple units or coaches, have variations of the selective door operating system.

At Times Square on track 4 of the 42nd Street Shuttle, the original platform was so short that only the first door of the third car was allowed to open at the station.

In Boston, the boarding platform at the Bowdoin terminus of the MBTA Blue Line accommodates only four of the train's six cars; passengers must press buttons to open the doors.

Passengers on most international flights arrive at the South Satellite, where they are inspected by U.S. Customs and Border Protection officials; after clearing inspection, passengers have the option of waiting in line to be inspected by the Transportation Security Administration so that they may access the rear two cars and secure area of the airport (to catch a connecting flight) or directly boarding the first train car which transports them to the airport exit and the baggage claim area.

In many NSW TrainLink stations in New South Wales, Australia, due to shorter platform length than trains, only selected doors will open.