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  2. Signalling control - Wikipedia

    en.wikipedia.org/wiki/Signalling_control

    The signal box provided a dry, climate-controlled space for the complex interlocking mechanics and also the signalman. The raised design of most signal boxes (which gave rise to the term "tower" in North America) also provided the signalman with a good view of the railway under his control. The first use of a signal box was by the London ...

  3. North American railroad signals - Wikipedia

    en.wikipedia.org/.../North_American_railroad_signals

    The first signals employed on an American railroad were a system of flags used on the Newcastle and Frenchtown Turnpike and Rail Road in the 1830s. The railroad then developed a more effective system consisting of wooden balls, painted red, white or black, and hoisted up or down a pole on a rope-and-pulley system.

  4. Lever frame - Wikipedia

    en.wikipedia.org/wiki/Lever_frame

    A mechanical lever frame inside the signal box at Knockcroghery in Ireland Waterloo station A signalbox, LSWR (Howden, Boys' Book of Locomotives, 1907). Mechanical railway signalling installations rely on lever frames for their operation to interlock the signals, track locks [1] and points to allow the safe operation of trains in the area the signals control.

  5. Railway signalling - Wikipedia

    en.wikipedia.org/wiki/Railway_signalling

    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. Railway signalling (BE), or railroad signaling (AE), is a system used to control the movement of railway traffic.

  6. Interlocking - Wikipedia

    en.wikipedia.org/wiki/Interlocking

    Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a diverging route, unless the corresponding points/switches had been changed first.

  7. Railway signal - Wikipedia

    en.wikipedia.org/wiki/Railway_signal

    Highball Signal – Historic railroad signal in Delmar, Delaware, US; North American railroad signals; Railway signalling – The principle of signals used to control railway traffic; Train protection system – Railway fail-safe against human error; Train speed optimization – A system that reduces the need for trains to brake and accelerate

  8. Railway semaphore signal - Wikipedia

    en.wikipedia.org/wiki/Railway_semaphore_signal

    A stop signal is any signal whose most restrictive indication is 'danger' (which compels a stop). Stop signals are used to protect junctions, points (North America - 'switches'), level crossings, movable bridges, platforms or block sections. A particular signal box may control one or more stop signals on each running line.

  9. Rail signaller - Wikipedia

    en.wikipedia.org/wiki/Rail_Signaller

    A hand-held railway signal lamp, on display at Israel Railway Museum. It was a signalman's duty to check each train that passed their signal box, looking for the red tail lamp exhibited on the trailing vehicle, the sighting of which confirmed that the train was still complete, and thus the section was clear.

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