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  2. Railway semaphore signal - Wikipedia

    en.wikipedia.org/wiki/Railway_semaphore_signal

    German semaphore home signals, which are totally different in appearance to the British semaphore signal, include one or two white arms with a red outline and a small circular disk at the end of it, and coloured lenses which display the position of the aspect(s) of the signal during nighttime operation and these arms face right of the post.

  3. North American railroad signals - Wikipedia

    en.wikipedia.org/.../North_American_railroad_signals

    A semaphore signal on the Atchison, Topeka and Santa Fe Railway in 1943. Semaphore signals were first developed in England in 1841. [2]: 169 Some U.S. railroads began to install them in the early 1860s, and semaphores gradually displaced other types of signals. The Union Switch & Signal company (US&S) introduced an electro-pneumatic design in ...

  4. Optical telegraph - Wikipedia

    en.wikipedia.org/wiki/Optical_telegraph

    The operators would move the semaphore arms to successive positions to spell out text messages in semaphore code, and the people in the next tower would read them. An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals (a form of optical communication).

  5. Railway signal - Wikipedia

    en.wikipedia.org/wiki/Railway_signal

    A railway signal is a visual display device that conveys instructions or provides warning of instructions regarding the driver's authority to proceed. [1] The driver interprets the signal's indication and acts accordingly.

  6. Australian railway signalling - Wikipedia

    en.wikipedia.org/wiki/Australian_railway_signalling

    There are two types of arms. A Distant signal uses a fishtail arm, Home and Starting signals use a square-tail arm. Semaphore distant signals in New South Wales are fitted with a fixed green light, positioned above the arm and spectacle, so that they may be easily distinguished from stop signals at night. Although yellow lights were trialled ...

  7. Semaphore - Wikipedia

    en.wikipedia.org/wiki/Semaphore

    Sailor with signal lamp. A signal lamp is a semaphore system using a visual signaling device, often utilizing Morse code. In the 19th century, the Royal Navy began using signal lamps. In 1867, then Captain, later Vice Admiral, Philip Howard Colomb for the first time began using dots and dashes from a signal lamp. [6]

  8. Railway signalling - Wikipedia

    en.wikipedia.org/wiki/Railway_signalling

    The earliest types comprised a board that was either turned face-on and fully visible to the driver, or rotated so as to be practically invisible. While this type of signal is still in use in some countries (e.g., France and Germany), by far the most common form of mechanical signal worldwide is the semaphore signal. This comprises a pivoted ...

  9. French railway signalling - Wikipedia

    en.wikipedia.org/wiki/French_railway_signalling

    The distant signal warns the driver to be able to stop before the next signal. Distant signals are typically used with the carré, the flashing red, the semaphore, and with a signal which is accidentally not working or a buffer stop. Flashing yellow (one flashing yellow light): proceed, expect stop at short distance from next Distant signal.

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