Train Whistle: With this wooden whistle you can play three different tones which together sound like a train signaling that it is approaching. We use the train whistle as a sound effect in stories and for songs about trains.
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The rule mandates when locomotive engineers sound horns — at least 15, but no more than 20 seconds, in advance of all public crossings; how they're sounded — in a pattern of two long, one short, one long blast; and how loud the horns are — between 96 and 110 decibels.
Modern diesel and electric locomotives primarily use a powerful air horn instead of a whistle as an audible warning device. However, the word whistle continues to be used by railroaders in referring to such signaling practices as whistling off (sounding the horn when a train gets underway).
Train whistles are used to communicate with other railroad workers on a train or in the yard. Specific combinations of long and short whistles have specific meanings. They are used to pass instructions, as a safety signal, and to warn of impending movements of a train.
The two largest companies that provide horns to the industry are Nathan Airchime and Leslie Controls. While Leslie horns were common on new locomotives years ago, the majority of new freight and passenger locomotives today are equipped with Nathan horns.
The absolute loudest train horns you can buy are genuine train horns used on locomotives made by Nathan AirChime, Leslie, and formerly Wabco, Hancock and Prime.