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  2. Charles Adler Jr. - Wikipedia

    en.wikipedia.org/wiki/Charles_Adler_Jr.

    Charles Adler Jr. (June 20, 1899 – October 23, 1980) was an American inventor and engineer.He is most known for developing devices meant to improve transportation safety, including sonically actuated traffic lights, colorblind road signals, pedestrian push-buttons, and flashing aircraft lights.

  3. Crossbuck - Wikipedia

    en.wikipedia.org/wiki/Crossbuck

    A special symbol in the center indicates an electric railroad crossing, cautioning road users about excessive height cargo that may contact the electric wires. In Australia, the crossbuck is a St Andrews Cross as in Europe, but uses words and the same color as the American crossbuck.

  4. Griswold Signal Company - Wikipedia

    en.wikipedia.org/wiki/Griswold_Signal_Company

    "Railroad Accessories Corporation" (RACO) merged with Griswold Signal Company in 1964. Manufacturing of crossing signals continued in Minneapolis. In 1971, RACO and Marquardt Industrial Products merged to form Safetran. Management, sales, and manufacture of crossing signals continued in Minneapolis until 2000, when the division moved to Kentucky.

  5. Wigwag (railroad) - Wikipedia

    en.wikipedia.org/wiki/Wigwag_(railroad)

    Wigwag is a nickname for a type of railroad grade crossing signal once common in North America, referring to its pendulum-like motion that signaled a train's approach. The device is generally credited to Albert Hunt , a mechanical engineer at Southern California 's Pacific Electric (PE) interurban streetcar railroad, who invented it in 1909 for ...

  6. Union Switch & Signal - Wikipedia

    en.wikipedia.org/wiki/Union_Switch_&_Signal

    US&S position light signal, 1922 US&S built the first power interlocking system in the United States, a pneumatic design, in 1882 at East St. Louis, Illinois . Within several years the company developed an electro-pneumatic system, which was widely adopted by railroads across the country.

  7. File:Griswold railroad crossing signals, Northeast ...

    en.wikipedia.org/wiki/File:Griswold_railroad...

    These railroad-crossing signals near the California Building in Northeast Minneapolis were built by the Griswold Signal Company of Minneapolis. Until very recently, they featured stop signs that rotated out to face the auto traffic when a train was coming. Camera manufacturer: NIKON CORPORATION: Camera model: NIKON D810: Author: August Schwerdfeger

  8. Level crossing signals - Wikipedia

    en.wikipedia.org/wiki/Level_crossing_signals

    The time interval may be controlled by a level crossing predictor, an electronic device which is connected to the rails of a railroad track, and activates the crossing's warning devices (lights, bells, gates, etc.) at a consistent interval prior to the arrival of a train at a level crossing. [1]

  9. Billups Neon Crossing Signal - Wikipedia

    en.wikipedia.org/wiki/Billups_Neon_Crossing_Signal

    It was installed in the mid-1930s by inventor Alonzo Billups over growing concern due to numerous accidents at the crossing involving trains and motor vehicles. Like nothing before, the Billups signal was a large gantry spanning the highway and was likely the first such use of a gantry-style crossing of the type now in relatively common use.