What do train noises mean?

Today, the only whistle signals you're likely to hear regularly are the grade-crossing warning (which is also often used to warn employees or others on the tracks); two (or three) shorts to indicate the engineer has received a signal to start the train forward (or backward); and one long blast when a train is ...



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Electric traction motors often produce electromagnetically induced noise. This high-pitch noise depends on the speed and torque level of the machine, as well as the motor type. Variable-frequency drives use pulse-width modulation, which introduces additional current harmonics and results in higher acoustic noise.

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One short whistle means STOP. One long whistle (three to 10 seconds) means the train is approaching a station. Two short whistles mean that the engineer acknowledges that he or she heard or saw a signal that affects movement. Three short ones mean that the engineer intends to make a reverse movement.

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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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The intensity of sound will vary at night, sometimes louder and sometimes softer. It has to do with the height and strength of a temperature inversion just above the ground. On clear, calm nights, it is cooler at the ground than higher up.

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By 1938, the Association of American Railroads had adopted the long-long-short-long signal for rail crossings. But whatever the horn pattern, the goal is to warn people well in advance that a train is coming. In 2021, 236 people were killed at highway-rail grade crossings in the US.

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And the main reason for that is safety. Locomotive engineers are required to honk every now and then, which is written down in the regulations called the Final Rule on the Use of Locomotive Horns.

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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.

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Different tracks have different amounts of vibration at different frequencies. And of course high speed routes even if you could feel them you may still not have time to get out of the way before a train obliterates you. So in some cases you'll feel the vibrations before the train comes and in others you may not.

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This rule applies 24 hours a day, even if a crossing is equipped with lights, bells and crossing gates. Train crews also may deem it necessary to sound a horn as a warning when there is a vehicle, person or animal near the tracks.

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Today, the only whistle signals you're likely to hear regularly are the grade-crossing warning (which is also often used to warn employees or others on the tracks); two (or three) shorts to indicate the engineer has received a signal to start the train forward (or backward); and one long blast when a train is ...

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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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Train horns must be sounded in a standardized pattern of 2 long, 1 short, and 1 long blasts. The pattern must be repeated or prolonged until the lead locomotive or lead cab car occupies the grade crossing. The rule does not stipulate the durations of long and short blasts.

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Federal Railroad Administration (FRA) rules require locomotive engineers to sound train horns between 15 and 20 seconds, but no more than a quarter-mile, in advance of all public grade crossings.

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In a quiet zone, railroads have been directed to cease the routine sounding of their horns when approaching public highway-rail grade crossings. Train horns may still be used in emergency situations or to comply with other Federal regulations or railroad operating rules.

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“There are times when mechanical and operational issues could also result in trains occupying a crossing for extended times,” the email continued, “and when trains stop for mandatory safety inspections or federally regulated crew changes.”

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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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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).

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