Time a bus or train is operating in revenue service, that is, time transporting revenue passengers. It includes layover time, but excludes pull-out, pull-in and off-route between two different lines. Compares with following measures: Total vehicle hours – Includes all of the above exclusions. Also called platform hours. Work time – Includes all of the above exclusions, plus adds the time provided to the operators for sign-on time (20 min.) and sign-off time (5 min.), plus travel time in a Company Equipment Assigned (CEA) unit, where applicable.