How many decibels is a high-speed train?

In the frequency range of 100-1000 Hz, the average sound pressure level of high-speed trains in open areas and tunnels is 75 dB and 85 dB respectively, while the maximum SPL is 85 dB and 96 dB respectively (Noh, 2018) .



The noise level of a high-speed train varies significantly depending on whether you are inside the cabin or standing trackside. For a passenger inside a modern train like the Shinkansen or KTX traveling at 300 km/h (186 mph), the noise level is remarkably quiet, typically hovering between 65 and 75 decibels (dB)—roughly the volume of a normal conversation or a vacuum cleaner. However, for someone standing 25 meters from the tracks, the exterior noise can reach 85 to 95 dB as the train passes. At speeds exceeding 300 km/h, the "aerodynamic noise" (the sound of the train cutting through the air) actually becomes louder than the mechanical "wheel-on-rail" noise. In 2026, many high-speed lines use extensive sound barriers and "low-noise" pantographs to mitigate this. For context, while the interior is comfortable, the exterior "whoosh" of a passing high-speed train is comparable to the sound of a lawnmower or a shout, which is why these tracks are often shielded by thick concrete walls in residential areas.

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At 25m from the track the 85-decibel noise of their 155mph high-speed train is mitigated by noise reduction measures mandated by law.

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Electric locomotives are quiet compared to diesel locomotives since there is no engine and exhaust noise and less mechanical noise. The lack of reciprocating parts means electric locomotives are easier on the track, reducing track maintenance.

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The screeching sounds heard on the London Underground are caused by the wheels of the trains rubbing against the rails.

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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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A high-speed train runs very smoothly on a railway line which fastening with high-quality rail fasteners, starting with uniform acceleration and uniform deceleration, so when in the train, we can hardly feel bumpy not just like a common train.

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NYC No. 999 4-4-0 was quite the speed demon for its time. The first locomotive to travel over 100mph, 999 hauled the Empire State Express and hit a world record speed of 112mph!

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At age 62, I could push a train car down a track. Unlike a steam engine that would hammer the rails (a main reason why they were retired), modern railcars glide with low friction, and crushed rock underneath the tracks helps diminish impact. You won't hear it or feel it, Rangel says.

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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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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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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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But what was measured exceeds that limit: The samples show the average noise levels on all subway platforms and on all subway rides (inside subway trains) is between 72.5 and 76.5 dB and between 74.1 and 75.8 dB, respectively.

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he brakes will be quickly applied. Typical noise levels due to air-brake operation range from 95 to 115 dB(A), in some cases as high as 120 dB(A).

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