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  2. General Railway Signal - Wikipedia

    en.wikipedia.org/wiki/General_Railway_Signal

    General Railway Signal was one of the 30 stocks when the Dow Jones Industrial Average [3] was expanded from a 20-stock average on October 1, 1928. It was replaced in the DJIA by Liggett & Myers on July 18, 1930. In 1965, General Signal Corporation (GSX) was created with the intent to diversify into areas other than railway signaling.

  3. 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 ...

  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. Annett's key - Wikipedia

    en.wikipedia.org/wiki/Annett's_key

    Alternatively, the key may be attached to the train staff for the section of running line containing the entrance to the siding. [5] [6] At manually-worked level crossings remote from signal boxes, the key to the gates can only be removed for use when the signals for the running line are locked at danger. [3]

  6. Signalling block system - Wikipedia

    en.wikipedia.org/wiki/Signalling_block_system

    On these lines the clearance of the controlled branch entry signal is the driver's sole authority to enter the branch, and once the train has passed that signal, the interlocking will hold it at 'danger' (and the signal cannot be cleared a subsequent time) until the branch service train, on its return journey has sequentially operated two track ...

  7. Railway signal - Wikipedia

    en.wikipedia.org/wiki/Railway_signal

    Railway signal in Ploiești West railway station, Romania. This type of signal is based on the German Ks signals. The signal head is the portion of a colour light signal which displays the aspects. To display a larger number of indications, a single signal might have multiple signal heads.

  8. Centralized traffic control - Wikipedia

    en.wikipedia.org/wiki/Centralized_traffic_control

    The ultimate solution to the costly and imprecise train order system was developed by the General Railway Signal company as their trademarked "Centralized Traffic Control" technology. Its first installation in 1927 was on a 40-mile stretch of the New York Central Railroad between Stanley, Toledo and Berwick, Ohio , with the CTC control machine ...

  9. Washington Metro signaling and operation - Wikipedia

    en.wikipedia.org/wiki/Washington_Metro_signaling...

    Red signal ahead of Silver Spring pocket track on the B Route. Signaling and operation on the Washington Metro system involves train control, station identification, train signaling, signage, and train length. As with any working railroad, communication between train operators, dispatchers, station personnel and passengers is critical.