Train Speed.Most U.S. freight trains are only allowed to go 60 mph max. In suburban areas they often go slower. Test suggest that they create an average of about 85 db of noise (at close proximity).
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If a sound is 100 dB at the source, it will be 94 dB at 1 meter, 88 dB at 2 meters, and so on. Therefore, you will generally be able to hear a 100 dB sound at a maximum of 16 meters.
The subway noise levels are around 90db. As you can tell from this brief scale, noises can reach unsafe levels rapidly. Most people do not have prolonged exposure to the sound of a subway train, but many face occupational noises that are equally as loud all day long.
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.
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. The maximum volume level for the train horn is 110 decibels, and the minimum sound level is 96 decibels.
Smoking is not permitted on trains. Do not leave a train if it stops between stations. In the event of danger, you can call the following num- bers. Police: tel.