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The tower and tracks at Deval interlocking, Des Plaines, Illinois, in 1993
The tower and tracks at Deval interlocking, Des Plaines, Illinois, in 1993
A model board and lever machine
A model board and lever machine
A view of the locking bed inside Deval Tower, Des Plaines, Illinois
A view of the locking bed inside Deval Tower, Des Plaines, Illinois
Part of a relay interlocking using miniature plug-in relays
Part of a relay interlocking using miniature plug-in relays
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A Class 66 locomotive (right) is waiting at a red signal while a First Great Western passenger train (left) crosses its path at a junction.
A Class 66 locomotive (right) is waiting at a red signal while a First Great Western passenger train (left) crosses its path at a junction.
A block signal and a 130 km/h speed limit at kilometer post 547 in Iisalmi, Finland
A block signal and a 130 km/h speed limit at kilometer post 547 in Iisalmi, Finland
Short signal blocks on the Toronto Transit Commission subway system. A train (not visible) has just passed the most distant, leftmost signal, and the
Short signal blocks on the Toronto Transit Commission subway system. A train (not visible) has just passed the most distant, leftmost signal, and the two most distant signals are red (stop and stay aspect). The next closest signal is yellow (proceed with caution), and the nearest signal shows green (proceed).
Traditional mechanical signals on display at a railway station in Steinfurt, Germany
Traditional mechanical signals on display at a railway station in Steinfurt, Germany