a junction or railroad crossing at grade where switches are controlled electronically by a dispatcher from a remote location
a place where railroad tracks meet, which has a signal system and mechanical controls in place to prevent trains from colliding
A device that prevents a bus form moving when the back door is open or the back door signal is illuminated.
An interconnection of signals and signal appliances such that their movements must succeed each other in a predetermined sequence, assuring that signals cannot be displayed simultaneously on conflicting routes.
An arrangement of signals and switches "interlocked" in such a way that their movements must succeed each other in a predetermined order so that a clear indication cannot be given simultaneously on conflicting routs. They are found at a crossing of two railroads, a drawbridge, a junction, or entering or leaving a terminal or yard.
An arrangement of signals and turnouts with their controls so interconnected as to prevent conflicting movements through any combination of tracks such as junctions, crossings, and crossovers. May be operated manually or automatically, and also by remote control.
A means of physically preventing apparatus (e.g.. points, signals) from being placed in potentially dangerous positions, particularly preventing one device being moved unless others are in the correct position.
The part of the railroad where tracks can cross each other or change or to direct trains along different routes. The interlocking itself is an arrangement of signals and signal appliances that permit train movements over controlled routes only if safe conditions exist.
An arrangement of interconnected signals and signal appliances for which interlocking rules are in effect. Signals and movement of signal appliances must succeed each other in proper sequence.
An arrangement of signal appliances so interconnected that their movements must succeed each other in proper sequence. It may be operated manually or automatically.