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. On one-person operated passenger trains, the driver must be able to see the whole train to make sure that all the doors are safe for departure.
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. On one-person operated passenger trains, the driver must be able to see the whole train to make sure that all the doors are safe for departure.
Source: Wikipedia "One-person operation" · CC BY-SA 4.0
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