Why are underground trains so loud?

The vibration caused when metal train wheels roll over metal tracks is carried through the tunnel and the ground around it to nearby buildings. To reduce the effects of noise and vibration we: Grind rails to remove corrugation - ridges or grooves on the rail surface can increase noise.



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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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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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If for no other reason, the horn can alert those folks to get to safety. either to alert people when they enter the tunnel(like MOW, or trespassers) or in some cases, to be friendly at kids(or railfans) at the tunnel entrance.

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Trains also use horns, whistles, bells, and other noise-making devices for both communications and warnings. The engines in diesel locomotives and DMUs produce significant amounts of noise. Newer locomotives have become much quieter in recent years due to noise regulations being implemented by countries and regions.

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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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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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Roding Valley is the most lightly used station on the Underground.

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The majority of Reddit users agreed that the Hainault Loop of the Central Line was the quietest part of the underground outside of rush hour. One user wrote: “Hainault Loop of the Central Line, any time away from rush hour.” Followed by another who boasted: “Yeah I was there last weekend and had it to myself.”

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