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The Nathan model M5 pictured is a 5 chime horn. 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. They are often extremely loud, allowing them to be heard from great distances.
An air horn is a pneumatic device designed to create an extremely loud noise for signaling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diaphragm. The stream of air causes the reed or diaphragm to vibrate, creating sound waves, then the horn amplifies the sound making it louder.
In the United States, train horns are required to have a minimum sound level of 96 dB and a maximum sound level of 110 dB at 100 ft (30 m) in front of the train. 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 ...
Those horns are a key safety feature for anyone near the tracks, but they can make other residents — even those who live miles away — aware every time a train passes, now on vastly increased ...
Even though Indian River County does ban train horns from 10 p.m. to 6 a.m., the regulation is unenforceable because it conflicts with a federal requirement that trains sound their horns 15-20 ...
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