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 (PERy) interurban streetcar railroad, who invented it in 1909 for safer railroad grade crossings.
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 (PERy) interurban streetcar railroad, who invented it in 1909 for safer railroad grade crossings.
Source: Wikipedia "Wigwag (railroad)" · CC BY-SA 4.0
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