Signalling control
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On a rail transport system, signalling control is the process by which control is exercised over train movements by way of railway signals and block systems to ensure that trains operate safely, over
Class 66 at Bardon Hill signal box in Leicestershire, England. It is a Midland Railway signal box dating from 1899, although the original mechanical lever frame has been replaced by electrical switches. Seen here in 2009.
Signal box and tracks at Deval interlocking, Des Plaines, Illinois, USA, in 1993
A mechanical lever frame inside the signal box at Knockcroghery in Ireland
Trimley Junction IFS panel in the 1988 replacement signal box, built by BREL York
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
Signalling control
…signal operator and the lineside signalling equipment. The technical apparatus used to control switches (points), signals and block systems is called an interlocking. Originally, all signaling was done by mechanical means. Points and signals were operated locally from individual levers or handles, requiring the…
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