Scope
ISO 3381:2013 / EN ISO 3381
Railway Interior Noise Measurement
ISO 3381 specifies standardized measurement procedures for determining sound pressure levels inside railbound passenger and freight vehicles under operating conditions. This test assesses passenger comfort, crew exposure, and compliance with occupational and environmental noise limits within train cabins and compartments. Manufacturers, operators, and occupational health consultants use these measurements to evaluate cabin acoustic quality, design noise control improvements, and ensure regulatory compliance. Accreditation guarantees consistent, defensible interior noise assessments that support both passenger safety and worker health protection.
What it measures
- A-weighted sound pressure level inside vehicle (dB(A))
- Noise levels at driver/operator positions
- Frequency analysis of interior noise (1/3 octave bands)
- Sound exposure level during typical operation
- Noise at passenger seating areas
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DIN EN ISO 3095
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BS EN ISO 3095
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NF EN ISO 3095
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UNI EN ISO 3095
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UNE EN ISO 3095
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NEN EN ISO 3095
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DIN EN ISO 14837-1
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BS EN ISO 14837-1
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NF EN ISO 14837-1
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UNI EN ISO 14837-1
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UNE EN ISO 14837-1
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NEN EN ISO 14837-1
1,516
Accredited labs
17
Countries
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Air Surveys
Active
(HSG 248) – 2021
APP 7 based on HSG 248
(PCM) based on HSG 248
(PCM) based on HSG 248)
APP 15 based on HSG 248
+ 2 more
(HSG 248) – 2021
AEC 1 based on HSG 248
(PCM) based on HSG 248
AEC 6 based on HSG 248
Airtech Analysis
Active
(HSG 248) – 2021
(PCM) based on HSG 248
staining based on HSG 248
(HSG 264, 2012)
Appendix 5 of HSG 227 (2004))
BS ISO 18283:2022
ASTM D2234 (location E)
ASTM D2013 (location B)
BS ISO 5074:2015; and
ASTM D409:2016
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Allied Aerosystems
Active
DC Resistance
2.92 mm systems (continued)
DC VOLTAGE
AC CURRENT
DC Power
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Amentum Clean Energy
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OM H-3 based on ISO 9698:2019
ISO 9696:2017 and ISO
(HSG 248) – 2021
(PCM) based on HSG 248
staining based on HSG 248.
Amentums Materials Testing and Research Laboratory part of Energy Safety and Risk Consultants (UK)
Active
a) BS 7270:2006
b) BS 3518-3:1963 (Withdrawn)
ASTM E1820-18ae1 (Withdrawn)
ISO 6892-2
BS EN ISO 204
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Anchem Laboratories
Active
(HSG 248) – 2021
ANC/AS/2 based on HSG 248
DIN EN 14791
IEC 60519-11
DIN EN 13284-1
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Andersen Caledonia
Active
requirements of HTM 01-06 Part E
35 °C/3 days based on HTM 2030
Part E, WHTM 01-06 Part E & BS EN
ISO 15883-4 using R2A and
Part E, HTM 0106 Part E, WHTM 01-
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Asbestos Analytical Services
Active
(HSG 248) – 2021
LSD.ASB.02 based on HSG 248
LSD.ASB.04 based on HSG 248
(PCM) based on HSG 248
(HSG 248) – 2021
QOP03 based on HSG 248
(PCM) based on HSG 248
(PCM) based on HSG 248)
QOP01 based on HSG 248
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