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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. 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.

  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. Signaling of the New York City Subway - Wikipedia

    en.wikipedia.org/wiki/Signaling_of_the_New_York...

    The equipment was built and installed by General Railway Signal and Union Switch and Signal. The NYCTA contributed between $20,000 to $30,000 on the project and supplied the three R22 subway cars to be automated. The bulk of the money, between $250,000 and $300,000, was contributed by the two companies, which paid for installation, maintenance ...

  6. Railway signalling - Wikipedia

    en.wikipedia.org/wiki/Railway_signalling

    Railway signalling (BE), or railroad signaling (AE), is a system used to control the movement of railway traffic. Trains move on fixed rails , making them uniquely susceptible to collision . This susceptibility is exacerbated by the enormous weight and inertia of a train, which makes it difficult to quickly stop when encountering an obstacle.

  7. 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 ...

  8. Union Switch & Signal - Wikipedia

    en.wikipedia.org/wiki/Union_Switch_&_Signal

    Union Switch & Signal (commonly referred to as US&S) was an American company based in Pittsburgh, Pennsylvania, which focused on railway signaling equipment, systems and services. The company was acquired by Ansaldo STS (from 2015, Hitachi Rail STS ) in 1988, [ 1 ] operating as a wholly-owned company until January 2009, when US&S was renamed ...

  9. Cab signalling - Wikipedia

    en.wikipedia.org/wiki/Cab_signalling

    The vertical light bar in the middle of the signal indicates the maximum permitted speed for the section of track where the lead car is currently located. Cab signaling is a railway safety system that communicates track status and condition information to the cab, crew compartment or driver's compartment of a locomotive, railcar or multiple unit.