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
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cartridges, based on HTM 2030
9.201 to 9.212 and BS EN ISO
35 °C/3 days based on HTM 2030
section 9.201 to 9.212, BS EN
ISO 15883-1:2009 6.4.2.3 and
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4-RAIL Services
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(HSG 248) – 2021
E203 based on HSG 248
(PCM) based on HSG 248
E200 based on HSG 248
E201 based ISO 14966:2019 using
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ABLE Calibration Services
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TEMPERATURE
PRESSURE
AC VOLTAGE (continued)
DC VOLTAGE
Generation only
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ABP Associates
Active
(HSG 248) – 2021
staining based on HSG 248
QP23 based on HSG 248
(PCM) based on HSG 248
(HSG 264, 2012)
HSG 227 (2004)
(HSG 248) – 2021
(PCM) based on HSG 248
ALS Laboratories (UK)
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on BS 4401:Part 3:1970(1986)
ISO 12966-2
AM/C/108 based on BS EN ISO
BS 684 2.14:2001
BS EN 288-Part 9 :1999
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APEC Environmental
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QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
AS International Corporation
Active
ISO 5983-1:2005/Cor.1:2008, ISO20483:201
07L.1.07 based on ISO 6865:2001
ISO 712
07L.1.02 based on ISO 6496:1999,
ISO 12966-2
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AWE
Active
(HSG 248) – 2021
LQP007 based on HSG 248
LQP003 based on HSG 248
(PCM) based on HSG 248
the guidance of GPG 14
PERSONAL DOSE EQUIVALENT:
RESPONSE:
Absolute Calibration
Active
DC Resistance
CFH-Gen, Macula-Degeneration
DC RESISTANCE (continued)
DC VOLTAGE
DC VOLTAGE (continued)
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Acorn Analytical Services
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(HSG 248) – 2021
(PCM) based on HSG 248
staining based on HSG 248
(HSG 264, 2012)
Appendix 5 of HSG 227
ISO 11654
BS EN ISO 10140-2:2021
ISO 7171
ISO 354
BS EN ISO 10140-3:2021
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Sound Calibrators
Pistonphones
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level
Microphones
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DIN EN ISO 11127-6
DIN EN 13727
1) BS EN ISO 11930:2019+
2) QMIC WI 22, based on BS EN
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