# Commission Decision of 30 May 2002 concerning the technical specification for interoperability relating to the rolling stock subsystem of the trans-European high-speed rail system referred to in Article 6(1) of Directive 96/48/EC (notified under document number C(2002) 1952) (Text with EEA relevance) (2002/735/EC), Division 7.4.1: Boundary Characteristics linked to interior noise (BP20)

Extent: E+W+S+N.I.

Noise levels in the driver's compartments must be kept as low as possible, by limiting noise at source through appropriate measures (acoustic insulation, sound absorption).
The Leq equivalent continuous noise level measured over 30 minutes must not exceed 78 dB(A) in the drivers' cabs of motive power units running at speeds of 160 km/h.
When higher speeds are involved, every effort should be made to achieve the same value specified above.
Values for speed = 300 km/h
open track
≤ 78 dB (A) recommended level
≤ 75 dB (A) target level
in tunnel regardless of the superstructure
≤ 83 dB (A) recommended level
≤ 80 dB (A) target level
while stationary, with auxiliary equipment
running and the windows closed
≤ 68 dB (A).

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Source: https://www.legislation.gov.uk/eudn/2002/735/annex/division/7/division/7.4/division/7.4.1 (the official version)
Page: https://openlegislation.uk/eu-decision-2002-735/annex/division-7/division-7.4/division-7.4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.