UIC 544-2

Railway Braking Force Estimation Methods

UIC 544-2 provides standardized calculation and estimation methods for determining braking force in railway rolling stock across different brake system types and operational scenarios. This technical standard defines mathematical models for translating brake system pressure, line force, and mechanical leverage into actual stopping power, accounting for variables such as wheel slip, temperature effects, and load conditions. The standard enables consistent performance prediction and certification across diverse European rail systems. Accreditation for this calculation methodology ensures reproducible, safety-critical engineering assessments used in rail fleet design and operational planning.

What it measures

  • Brake force calculation from system pressure and geometry
  • Adhesion coefficient effects on available braking force
  • Load-dependent braking force variations
  • Dynamic brake force response characteristics
  • Braking force distribution optimization
🇧🇪 NBN EN 14531-1 🇩🇪 DIN EN 14531-1 🇬🇧 BS EN 14531-1 🇫🇷 NF EN 14531-1 🇮🇹 UNI EN 14531-1 🇪🇸 UNE EN 14531-1 🇳🇱 NEN EN 14531-1
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(5 ± 0,2) · 10-2 mol/mol (1000 ± 50) · 10-6 mol/mol (15 ± 2) · 10-6 mol/mol
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ENAC LE2749 Zaragoza, ES
UNE-EN 12341 20 ⋅ 10-9 mol/mol ≤ C ≤ 500 ⋅ 10-9 mol/m 0,015 l/min ≤ Q ≤ 50 l/min 20 ⋅10-9 mol/mol ≤ C ≤ 100 ⋅ 10-9 mol/mo 100 ⋅ 10-9 mol/mol ≤ C ≤ 1000 ⋅ 10-9 mol + 3 more
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DIN EN ISO 11885 DIN EN ISO 15587-2 DIN EN 13657 DIN EN ISO 10523 DIN EN ISO 10304-1 + 3 more
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DAkkS D-PL-19033-01-01 Würzburg, DE
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DAkkS D-K-15110-01-01 Hartmannsdorf, DE
Railway brake — magnetic track brakes (U Railway brakes — conditions for homologa Railway brakes — electropneumatic brakes Railway bogies — wheelsets and bogies st - Gleichspannung + 3 more
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COFRAC 1-0869 Paris, FR
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UKAS 31703 Eastbourne, GB
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DIN EN ISO 11737-2 DIN EN ISO 17664-1 ISO 17664-2 DIN EN ISO 11607-2 DIN EN 868-5 + 3 more
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ACCREDIA 00248 Milano, IT
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COFRAC 1-6879 Vitry Sur Seine, FR
Occupational noise exposure measurement Railway pass-by noise measurement (ISO 3 Railway catenary — current collection qu Railway driver warning systems — braking Railway brake friction material characte + 3 more
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ACCREDIA 00087 Trino, IT
DIN EN ISO 9698 UNI 11015 ISO 11704 UNI 11665 ISO 9698
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ACCREDIA 01966 Alessandria, IT
ISO 9308-2 APAT CNR IRSA 2030 Man 29 2003 APAT CNR IRSA 2060 Man 29 2003 APAT CNR IRSA 4020 Man 29 2003 APAT CNR IRSA 2040 B Man 29 2003 + 3 more
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ACCREDIA 00612 Rivalta Scrivia, IT
DIN EN 12350-1 DIN EN 12350-6 DIN EN 12390-3 DIN EN 12390-5 DIN EN 12390-8 + 3 more
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COFRAC 1-5877 Frejus, FR
NF X 43-050 NF X 43-269 ISO 16000-7 FD X 46-033
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COFRAC 1-6328 Lissieu, FR
NF X 43-050 NF X 43-269 ISO 16000-7 FD X 46-033
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DIN EN 27888 DIN EN 12880 DIN EN 196-2 DIN 18123 DIN EN 196-6 + 3 more
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UKAS 1089 Burton-on-Trent, GB
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COFRAC 1-7224 Cenon, FR
NF X 43-050 NF X 43-269 ISO 16000-7 FD X 46-033
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Industries

Railway rolling stock engineering and design Brake system manufacturers and integrators Railway fleet operators Rail vehicle certification authorities Transport safety and compliance consulting

Related Standards

  • UIC 544-1 Railway brakes — Braking performance
  • UIC 541-01 Railway brakes — Brake pads — Part 1: Friction material specification
  • EN 14531-1 Railway applications — Safety requirements for the design of rolling stock

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