Eli5 My three year old boy wants to know why do trains whistle? And different times in there journey? We hear train whistles from our house.
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[Train horn](https://en.wikipedia.org/wiki/Train_horn) operation varies from country to country.
Edit: [here’s a video suitable for a kid](https://www.youtube.com/watch?v=eI6xSjkcXTY). (US)
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