One-person operation (OPO), also known as driver-only operation (DOO), one-man operation (OMO), single person train operation (SPTO), or one-person train operation (OPTO), similarly to Driver Controlled Operation, is operation of a train, bus, or tram by the driver alone, without a conductor.
A freight train driver on a one-person operated DB Schenker Rail train in Denmark
A platform mirror for driver-only operation at Vykhino station, Moscow Metro in Russia
A Birney streetcar, one of the first public transport vehicles designed specifically for one-person operation
A Danish train driver on a S-train looking out of the side window to make sure all the doors are safely closed for departure
A conductor or guard is a train crew member responsible for operational and safety duties that do not involve actual operation of the train/locomotive. The conductor title is most common in North American railway operations, but the role is common worldwide under various job titles. In Commonwealth English, a conductor is also known as guard or train manager.
A conductor on an Amtrak train
German conductor signaling for the departure of a train. The red armband on his uniform identifies him as a conductor.
Hungarian MÁV conductor
A Russian train conductor in front of the express train "Repin"
