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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 ...
Other names include railway level crossing, [1] railway crossing (chiefly international), grade crossing or railroad crossing (chiefly American), [2] road through railroad, criss-cross, train crossing, and RXR (abbreviated). There are more than 100,000 level crossings in Europe and more than 200,000 in North America.
Level crossing signals are electronic warning devices for road vehicles at railroad level crossings. Level crossings can be operated in various ways. In some countries such as the UK, the warning devices are more often than not activated by remote control, I.e. an operator pressing buttons. However, the majority of countries have automated systems.
AREMA has 29 technical committees, organized in six functional groups. The committees, whose volunteer members come from the railroad industry, meet on a regular basis and use their expertise to come up with the best methods to maintain a railroad. [2] Structures Timber Structures (Committee 7) Concrete Structures & Foundations (Committee 8)
Magnetic Signal is the company credited with the invention of the wigwag grade crossing signal once common throughout Southern California. "Railroad Accessories Corporation" (RACO) merged with Griswold Signal Company in 1964. Manufacturing of crossing signals continued in Minneapolis.
Grade-separated pedestrian and cycling routes often require modest space since they do not typically intersect with the facility (such as a highway) that they cross. However, grade-separated pedestrian crossings with steps introduce accessibility problems. Some crossings have lifts, but these can be time-consuming to use.
The exposure index at these three crossings was already high more than a decade ago when the N.C. Department of Transportation and the City of Durham studied 18 crossings along the N.C. Railroad ...
United States Federal Railroad Administration regulations restrict trains to a maximum speed of 110 mph (177 km/h) at standard grade crossings. Crossings are permitted up to 125 mph (201 km/h) only if an "impenetrable barrier" is in place to block traffic when a train approaches.