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A train horn is an air horn used as an audible warning device on diesel and electric-powered trains. Its primary purpose is to alert persons and animals to an oncoming train, especially when approaching a level crossing .
A train whistle or air whistle (originally referred to as a train trumpet or air trumpet) is an audible signaling device on a steam or gas locomotive, used to warn that the train is approaching, and to communicate with rail workers. Modern diesel and electric locomotives primarily use a powerful air horn instead of a whistle as an audible ...
To distinguish their sound from truck and bus air horns, train horns in the U.S. consist of groups of two to five horns (called "chimes") which have different notes, sounded together to form a chord. In Japan , most modern trains like 209 series or E233 series from the first half of the 1990s onwards use electric horns as primary in passenger use.
The Federal Railroad Administration requires local governments to take a number of steps before they can apply for train horn quiet zones.
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Rail squeal is a sound caused by a train's wheels slipping under specific conditions, usually around sharp curves. [4] Air displacement of a train in a tunnel can create noise from turbulence. Trains also use horns, whistles, bells, and other noise-making devices for both communications and warnings.