This test measures micro and macro-scale surface roughness on railway wheels and rails to assess their contribution to rolling noise generation. Surface irregularities on the wheel-rail interface are primary sources of railway noise, making this measurement essential for noise control and environmental compliance. The test uses standardized contact filtering and measurement zones to quantify roughness parameters that correlate with noise emissions. Railway infrastructure managers, wheel manufacturers, and rolling stock operators use this test to monitor equipment maintenance and optimize noise reduction strategies. Accredited testing provides validated data for environmental impact assessments and compliance with EU noise directives.
What it measures
Macroscopic roughness (wavelength 3–300 mm)
Microscopic roughness (wavelength 0.1–3 mm)
Peak-to-valley surface irregularities
Root mean square roughness values (Ra, Rz, Rq)
Wavelength-specific roughness spectra
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DIN EN ISO 3274
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BS EN ISO 3274
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NF EN ISO 3274
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UNI EN ISO 3274
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UNE EN ISO 3274
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NEN EN ISO 3274
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DIN EN 13674-1
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BS EN 13674-1
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NF EN 13674-1
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UNI EN 13674-1
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UNE EN 13674-1
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NEN EN 13674-1
requirements of HTM 01-06 Part E35 °C/3 days based on HTM 2030Part E, WHTM 01-06 Part E & BS ENISO 15883-4 using R2A andPart E, HTM 0106 Part E, WHTM 01-+ 3 more
Railway infrastructure and track operatorsWheel and axle manufacturingRolling stock manufacturersRail grinding and maintenance contractorsEnvironmental and noise control consultants
Related Standards
ISO 3274Geometrical product specifications (GPS) — Surface texture: Profile method — Nominal characteristics of contact (stylus) instruments
EN 13674-1Railway applications — Track — Rail — Part 1: Vignole railway rails 46 kg/m and 54 kg/m
EN 15313Railway applications — Wheels and wheelsets — Acceptance criteria for wheels — Safety and quality requirements
Scope