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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 ...
A Pennsylvania Railroad high signal displaying Approach Medium Amtrak colorized position lights at Trenton, New Jersey. Position light signals use rows of 5 + 3 ⁄ 8-inch-diameter (140 mm) lamps to simulate the positions of an upper quadrant semaphore blade.
In its heyday, the Magnetic Signal Company not only manufactured wigwag signals, but also the alternating-flasher type [2] railroad signals, reflectorized "Railroad Crossing" [3] signs, button reflectors for highway signs, traffic island beacons, curb beacons, flasher relays, automobile and bicycle reflectors, and even a "Portafount" portable ...
"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.
In 1933, Adler’s double-filament lamp was installed on the Pennsylvania Central Railroad. The ability of the bulb to function at half-capacity, even when burnt out, was beneficial in keeping railroad crossing lights functioning for long periods of time. The system remained part of the Pennsylvania Central Railroad until the 1970s. [3]
The bell has been commonly referred to as the "Teardrop" bell by railroaders and signal fans alike because of its unique shape and thus the name has stuck. This bell has appeared on advertising literature for railroad signals as far back as the 1920s as far abroad as Chile and Italy on early wig wag crossings and flashers.
Among their products are railroad crossing signalling parts, branded with the GRSA logo, instead of the usual GRS. This facility was closed in the early 1980s. In 1986, GRS joined with China National Railway Signal & Communication Group Corporation (CRSC) to form the Chinese-American Signal Company (CASCO) in Shanghai, China , which produces ...
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]
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