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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 ...
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.
Several distinct sounds are created by various parts of the train, such as engines, traction motors, brakes, and the wheels rolling on the rails. Roughness and irregularities on the wheel and rail surfaces are a source of noise and vibration. Rail joints and squats on the rail cause a familiar "clickety-clack" sound as train wheels roll over them.
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Thus, an outstretched hand reaching upward and pumping is a signal to the driver of an air horn equipped vehicle, requesting a toot. In modern trucks and buses, the horn is actuated by a button on the steering wheel (just like a normal car horn). Some trucks and buses have both electric and air horn, selectable by a switch on the dashboard.
For years, Columbia leaders have weighed spending millions on a project to create “quiet zones” that would silence train horns that echo daily throughout the city — white noise to some, but ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 14 January 2025. This is a list of onomatopoeias, i.e. words that imitate, resemble, or suggest the source of the sound that they describe. For more information, see the linked articles. Human vocal sounds Achoo, Atishoo, the sound of a sneeze Ahem, a sound made to clear the throat or to draw attention ...
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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