encyclopedia

SIGN-UP (BIDDING RUNS, MARK-UP, OPERATOR PICK, PICK,

The procedure by which, at regular intervals or when new service or realignments of service are implemented, operators select their regular assignment for an upcoming period (typically several months). The order of selection is usually by operator seniority and is…

SIGNAL

Method or device, the aspect of which conveys information affecting movement of trains.

SIGNAL ASPECT

1. The appearance of a fixed signal conveying an indication, as viewed from the direction of an approaching rail unit. 2. The appearance of a cab signal conveying an indication, as viewed by an observer in the cab of a…

SIGNAL PREEMPTION

In highway operations, an automatic or manual device for altering the normal signal phasing or the sequence of a traffic signal to provide preferential treatment for specific types of vehicles, such as buses or trains. (TRB)

Signal Synchronization

Traffic signal synchronization refers to the functioning relationship between active signals along a corridor. A common cycle length is established. All intersections in the coordinated system have the same cycle length. By maintaining a constant relationship between the signals at…

SIGNAL-ACTUATING DEVICE

Pedestrian Signal-Actuating Device and Vehicle Signal-Actuating Device.

SIGNAL, CAB

Speed command indication on the train operator’s console displaying maximum operating speed.