Interlocking
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In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings. In North America, a se
The tower and tracks at Deval interlocking, Des Plaines, Illinois, in 1993
A model board and lever machine
A view of the locking bed inside Deval Tower, Des Plaines, Illinois
Part of a relay interlocking using miniature plug-in relays
Railway signalling
Videos
Railway signalling, or railroad signaling, is a system used to control the movement of railway traffic. Trains move on fixed rails, making them uniquely susceptible to collision. This susceptibility i
Interlocking
…In railway signalling, an interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or…
A Class 66 locomotive (right) is waiting at a red signal while a First Great Western (now Great Western Railway) passenger train (left) crosses its path at a junction.
British lower-quadrant semaphore stop signal (absolute) with subsidiary arm (permissive) below
A block signal and a 130 km/h speed limit at kilometer post 547 in Iisalmi, Finland
Railway infrastructure on the hill-country main line, Sri Lanka, including a gantry of semaphore signals