A train whistle, also known as an air whistle or steam trumpet, is an audible signaling device on a steam locomotive used to warn that the engine is approaching and to communicate with rail workers. Whistles are necessary on locomotives because of their susceptibility to collision, due to their size and movement on fixed rails. Steam whistles were often activated by a pull cord or lever permitting some form of expression, and it was usually evident by the sound who was operating the…
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