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
1,273
Accredited labs
15
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Asbestos Survey & Management
Active
QOP03 based on HSG 248
QOP01 based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
AstraZeneca UK
Active
DC CURRENT
AC VOLTAGE (continued)
AC CURRENT
AC Voltage
DIMENSIONAL
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Analysts’ Guide (HSG 248)
(HSG 248) – 2021 Asbestos: The
(PCM) based on HSG 248
Ayerst Environmental
Active
(HSG 248) – 2021 )
(PCM) based on HSG 248
Surveying) based on HSG 248
BS EN ISO 10140-2:2021
BS EN ISO 10140-3:2021
BS EN ISO 717-2:2020
ISO 7171
BS EN ISO140-3:1995 (withdrawn)
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Babcock Marine [Rosyth]
Active
(HSG 248) – 2021
14B based on HSG 248
DIN EN 12021
14A based on HSG 248
(PCM) based on HSG 248
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Birmingham City Council
Active
(HSG 248) – 2021 )
(PCM) based on HSG 248)
(PCM) based on HSG 248
staining based on HSG 248
(HSG 264, 2012)
staining based on HSG 248
(HSG 248) – 2021
(PCM) based on HSG 248
(HSG 264:2012)
Bridgend Asbestos Services
Active
(HSG 248) – 2021
P10.2 based on HSG 248
(PCM) based on HSG 248
Based on ISO 10312:2019 and ISO
SOP 16 by XRD (ISO BS EN
C G C Laboratory
Active
(HSG 248) – 2021
(PCM) based on HSG 248
SOP 5, based on HSG 248
SOP 4, based on HSG 248
C.W.E. Services
Active
(HSG 264, 2012)
HSG 227 (2004))
Safety Executive guides HSG 264
(2012) and App 3 of HSG 227
(HSG 248) – 2021
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DIN EN 13284-1
BS ISO 9096:2017
requirements of BS EN 15259:2007
Standard and BS EN 15259:2007
DIN EN ISO 16911-1
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DC VOLTAGE
DC Resistance
DC CURRENT
AC Current Generation
Generation (continued)
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Campbell Associates
Active
Sound Calibrators
FREQUENCY
Microphones
based:
½” & ¼” microphones @ 250 Hz
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BS ISO 488:2008, 2446:2008 and
on BS 4401:Part 3:1970(1986)
BS 696-2:1989 (superseded and
BS ISO 6731:2010
ISO BS EN 3727-1:2002
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