noun
one-man bus; one-man train; conductorless bus; conductorless train
A bus or train operated by the driver alone, without a conductor. Common in Japan for local buses and some rural trains.
wasei-eigo (Japanese-coined English), from one-man car
この路線はワンマンカーなので、運転手が料金を収受します。
This route is a one-man bus, so the driver collects the fare.
ワンマンカーでは、乗客は前のドアから乗ってください。
On a one-man bus, please board through the front door.