Why do I hear train horns at night when they are nowhere near me?

At night, the air near the ground can have a different temperature than air only a few hundred feet above1. This affects the transmission of sound waves. There is usually less ambient noise after dark, so the distant train sounds louder. As pointed out elsewhere, maybe the trains don't use the horn in daytime.



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In the US, a train horn is to be blown before a grade crossing unless the area is designated a quiet zone and other mechanisms are in place to warn and stop road traffic. At other times, the horn can be used to signal that the train is going to start or back up or as a warning for people or animals on the track.

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Train horns are installed on locomotives to warn motorists or pedestrians of an approaching train at a highway-rail grade crossing.

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The horn alerts people that a train is approaching a railroad crossing. It can also be used to warn animals or trespassers in our right-of-way along a section of track. Many people don't realize that federal and state regulations require us to sound the horn whenever we approach any crossing.

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Under the Train Horn Rule (49 CFR Part 222, issued on August 17, 2006), locomotive engineers must begin to sound train horns at least 15 seconds, and no more than 20 seconds, in advance of all public grade crossings.

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Answer #1: It's a wave of communicating between the train driver and workers on the tracks to acknowledge that the driver has seen them. Answer #2: For safety reasons – to make sure the horn is working before you leave the station.

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- One long whistle-like sound can be heard when the train is coming to a halt, and the engineer applies the air brakes. - Two long honks mean that the train has released the brakes and is ready to continue its journey.

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“People assume that trains are loud, but that assumption is based on the fact that when a train's gone past them in a station it's noisy. That's because the noise a train makes is mainly projected to either side. When trains are moving directly towards you they are barely audible–until it's too late.”

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It is true that the right carpet and drapes can, in fact, work wonders for train noise reduction. While a great carpet can absorb noise from below, heavy drapes and curtains are capable of reducing echoes. It is recommended that drapes be hung on opposite sides of the room to trap even more noise.

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If you hear, two small horns, it means the motorman is asking the guard to direct the railway signal to start the train. In case you hear three smaller horns, it suggests that the motorman has lost control over the train. This also acts as a signal to pull the vacuum break immediately. This signal is rarely heard.

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Anyway, don't blame the engineer: They're required to blow that horn. The regulation in question is called the Final Rule on the Use of Locomotive Horns—a name that strongly implies they've had just about enough of your bitching—and it requires four blasts 15 to 20 seconds before every crossing.

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Noise pollution and vibrations are some of the biggest concerns, particularly for people who live within one-third of a mile of railroads or railyards, says Natalia Caldeira Loss Vincens, an expert in public health at the University of Gothenburg in Sweden.

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Rail squeal is a screeching train-track friction sound, commonly occurring on sharp curves. Squeal is presumably caused by the lateral sticking and slipping of the wheels across top of the railroad track. This results in vibrations in the wheel that increase until a stable amplitude is reached.

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Why do trains sound their horn? Federal law requires the train crew when approaching a road crossing to sound the horn at all public crossings for the protection and safety of motorists and pedestrians regardless of whether crossings with gates and lights are present.

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A train whistle or air whistle (originally referred to as a steam trumpet) is an audible signaling device on a steam locomotive, used to warn that the train is approaching, and to communicate with rail workers.

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