ISO 24221:2024Published

Railway applications — Brake system — General requirements

Applications ferroviaires — Système de freinage — Exigences générales

A new edition is under development: ISO/AWI 24221-1.

Abstract / scope

This document specifies the general requirements for brake systems. This document focuses on general principles and general requirements of brake systems.

This document is applicable for all types of rolling stock during design and whole lifetime. This document does not specify the braking performance criteria.

This document can be applied to all rolling stock with metal to metal wheel/rail contact irrespective of speed classification.

Life cycle

Amendments & corrigenda

ISO 24221:2024/Amd 1:2026PublishedRailway applications — Brake system — General requirements — Amendment 1International Standard · Published 22 Sep 2026 · ISO/TC 269/SC 2

Replaced by

ISO/AWI 24221-1Under developmentRailway applications — Braking system — Part 1: General requirementsInternational Standard · ISO/TC 269/SC 2