How loud will HS2 be?

Despite an absence of official numbers, the chairwoman of the Stop HS2 group, Lizzy Williams, estimates at 50m from the track, the noise from the trains will be between 95 and 97 decibels every two minutes if the line runs at capacity. But speed isn't the only determinant of train noise.



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The duration of noise is brief for high-speed trains when compared to traditional train systems which take longer to pass. High-speed trains are powered by an electric propulsion system which, when compared to the more common diesel train engines, generates significantly less noise.

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The noise levels in the proximities of the rail line vary from 68 to 80 dB(A), in contrast with the situation with the horn blowing, when the levels varied from 80 to 92 dB(A). 3D noise map of the train passing without blowing its horn.

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90 dB: Subway train. 100 dB: Factory machinery. 110 dB: Car horn. 120 dB: Ambulance siren.

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You may only sit or stand in the section of the train where your ticket is valid. Only use the emergency brake in the event of danger.

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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.

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Broadly speaking these trains are no worse than the noise from a highway and generally more acceptable in that the noise is not continuous, whereas the noise from a highway is a constant buzz throughout the day and often throughout the night as well.

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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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The HS2 Action Alliance criticised the Department of Transport's demand forecasts as being too high, as well as having other shortcomings in the assessment methodology. Action Groups Against High Speed Two (AGHAST) claimed in 2011 that the project was not viable economically.

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Capable of speeds of up to 225mph (360km/h), the fully electric trains will also run on the existing network to places such as Glasgow, Liverpool, Manchester and the North West.

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Tardiness is not the only problem. The company has been consistently posting losses in recent years and is currently more than €30 billion ($32.6 billion) in debt. Passengers routinely complain of overcrowded trains and expensive tickets.

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