double-end

double-end (third-person singular simple present double-ends, present participle double-ending, simple past and past participle double-ended)

1. (rail transport, transitive) To operate a train with a locomotive at each end.
2. (rail transport, transitive) To operate a train, especially a multiple unit, with a driver at each end of the train for fast turnaround times.

• double-ended

• step back, stepping back