UIC 541-04

Automatic Variable Load Brake Testing

This test defines specifications for automatic variable load braking systems that adjust braking force proportionally to the vehicle's loading condition, optimizing stopping distance and wheel adhesion. The standard covers the design, functionality, and performance requirements of automatic load-sensing brake control equipment fitted to freight and passenger trains. Testing verifies that braking force automatically adjusts across the range from empty to fully loaded conditions, enhancing safety and reducing wheel slide risk. Accreditation for this test is critical for manufacturers of brake control systems and railway operators ensuring consistent, safe braking performance regardless of train loading.

What it measures

  • Load-proportional braking force adjustment mechanisms
  • Response characteristics across loading range
  • Wheel adhesion optimization and anti-lock performance
  • System reliability and fail-safe functionality
  • Pressure modulation and control accuracy
🇩🇪 DIN EN 14198 🇬🇧 BS EN 14198 🇫🇷 NF EN 14198 🇮🇹 UNI EN 14198 🇪🇸 UNE EN 14198 🇳🇱 NEN EN 14198
1,323 Accredited labs
15 Countries

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Tru-Cal Metrology

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UKAS 0716 Gorton, GB
including dial and digital LENGTH (cont’d) Plain plug gauges (taper) ANCILLARY MEASUREMENTS Plain ring gauges (taper) + 3 more
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Tyneside Standards

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UKAS 0566 Jarrow, GB
Micrometers See Notes 3 and 5 See Note 6 Caliper length bars) – See Note 5 + 3 more
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UK Health Security Agency, Food, Water and Environmental Microbiology Services

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UKAS 1645 London, GB
FNED142 BS EN ISO 11816- FNES67 (P1) based on BS EN ISO FNES16 (F13) based on ISO 6579-1:2017+A1 FNES16 (F13) based on BS EN ISO 6579-1 + 3 more
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UL International (UK)

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UKAS 5772 Basingstoke, GB
DIN EN 12209 DIN EN 1155 DIN EN 12179 DIN EN 1935 DIN EN 1670 + 3 more
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UL VS

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UKAS 0224 Finchampstead, GB
(HSG 264, 2012) and Appx. 3 of HSG 227 (2004)) guides HSG 264 (2012) and ACoP L8 and BS 8580-1:2019
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Uniper Technologies

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UKAS 2200 Ratcliffe-on-Soar, GB
DIN EN 13284-1 BS EN ISO 23210:2009 requirements of BS EN 14181:2014 IEC 60519-11 requirements of BS EN + 3 more
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University of Salford

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UKAS 1660 Salford, GB
DIN EN 12667 ISO 8301 DIN EN 12939 DIN EN 12664 DIN EN ISO 13163 + 3 more
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University of Salford

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UKAS 0801 The Crescent, GB
Pistonphones Microphones LS2/WS2 microphones based: Reverberation Time
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VEGA Environmental Consultants

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UKAS 1634 Whitley Bay, GB
(HSG 248) – 2021 ASB/10 based on HSG 248 (PCM) based on HSG 248 ASB/6 based on HSG 248 BS EN ISO 14644-1:2015 + 3 more
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VWR International

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UKAS 0593 Lutterworth, GB
TEMPERATURE parameters and ranges) indicators or recorders WEIGHING INSTRUMENTS
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Vantify

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UKAS 7892 Stoke Prior, GB
Appendix 5 of HSG 227 (2004) (HSG 264, 2012)
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Vine Consultant Services

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UKAS 10213 Bishops Stortford, GB
(HSG 264:2012) 5 of HSG 227 (2004))
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Vintec Laboratories

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UKAS 1249 Garston, GB
(HSG 248) – 2021 (PCM) based on HSG 248 P052 based on HSG 248
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W H Stephens

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UKAS 7855 Belfast, GB
(HSG 264, 2012)
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WSP UK

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UKAS 2538 London, GB
(HSG 248) – 2021 AFC based on HSG 248 (PCM) based on HSG 248 SSA based on HSG 248
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Wessex Power Technology

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UKAS 20481 Winterborne Zelston, GB
TEMPERATURE controllers, and recorders) RELATIVE HUMIDITY
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Westfield Compliance (Technical Services)

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UKAS 21065 Cleckheaton, GB
Analysts’ Guide (HSG 248) (PCM) based on HSG 248 staining based on HSG 248
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Westland Environmental Safety

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UKAS 7567 Newcastle-Under-Lyme, GB
(HSG 248) – 2021 SOP 12 based on HSG 248 (PCM) based on HSG 248 SOP 11 based on HSG 248
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Westward Laboratories

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UKAS 1830 Callington, GB
ISO 21528-2 BS ISO 4832:2006 BS ISO 16649-2:2001 Method No 2.9 based on BS EN ISO Method No 2.12 based on BS EN + 3 more
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Wil-Test Solutions

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UKAS 21819 Birchwood, GB
BS 1377-2:2022 BS 1377-9:1990 DIN EN 1097-5 BS EN ISO 17892-1:2014+A1:2022 purposes (BS 1377-2:2022
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Winkhaus (UK)

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UKAS 1989 Kettering, GB
DIN EN 12046-2 DIN EN 12094-8 DIN EN 949 BS 6375-2:2009 DIN EN 950 + 3 more
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i2 FAST

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UKAS 10852 Hemel Hempstead, GB
BS 4401-1:1998 Using N008-1 based on BS EN ISO 12966-4 2015 N008-2 based on BS EN N011 based on BS 4401-9:1975 and BS 770- + 3 more
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ifp-labs UK West Yorkshire

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UKAS 1916 Hebden Bridge, GB
on BS 4401:Part 3:1970(1986) ISO 12966-1:2014 and ISO 12966-4 CH 4026 based on BS 5766:Part CH 4001 based on BS EN 12014- + 3 more
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Industries

Railway rolling stock manufacturers Brake control system suppliers Freight train operators Passenger rail services Railway certification and safety authorities

Related Standards

  • UIC 541-01 Railway brakes — Braking power
  • UIC 541-05 Railway brakes — Anti-slide device
  • EN 14198 Railway applications — Wheelsets and bogies — Safety requirements for thermal management

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