ISO 24221:2024 PDF

Name: ISO 24221:2024 — Railway applications — Braking system — General requirements
SKU: ISO 24221:2024
Price: 25 EUR
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Railway applications — Braking system — General requirements

Название (английский):

ISO 24221:2024

Railway applications — Braking system — General requirements

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 23
Дата публикации:: 8 марта 2024 г.
Издание:: ISO IS 24221 edition 1 version 1
ICS:: 45.060.01

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Описание (английский):

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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 24221:2024 - Railway applications - Braking system - General requirements defines the general principles and lifecycle requirements for brake systems on rail vehicles. Applicable to all rolling stock with metal‑on‑metal wheel/rail contact regardless of speed classification, the standard covers design, safety, verification and operational requirements for the main brake system (service, emergency and stationary/parking brakes). It does not prescribe specific braking performance criteria but establishes the functional, safety and compatibility framework to be used during design and throughout a vehicle’s lifetime.

Key topics and technical requirements

Scope and applicability

Applies to all types of rolling stock during design and whole lifetime (metal‑to‑metal wheel/rail contact).
Does not set stopping‑distance or performance targets.

Main brake system functions

Must provide service, emergency and stationary brake application and release.
Trainwide control devices, brake demand devices, control lines, local controllers, brake units, monitoring and distributed energy storage are core elements.

Safety and redundancy

A single failure in the main brake system shall not cause loss of more than 50% of total train braking force.
Emergency brake function must be automatic; loss of integrity (e.g., unintended separation) must trigger an emergency application.
Emergency brake control signal propagation speed requirement: ≥ 250 m/s.
Emergency demands override traction; cancellation does not auto‑release brakes - intentional action required to release.

Energy and inexhaustibility

Sufficient on‑board energy (distributed along the train) must be available for at least one emergency stop from maximum speed in any loading up to maximum braking load; local energy must consider Wheel Slide Protection (WSP) consumption under degraded conditions.

Operational modes and degradations

Definitions and handling for normal, degraded mode (component failures) and degraded condition (external factors such as low adhesion).
Includes requirements for brake management / brake blending, additional brakes (independent dynamic/direct brakes), wheel slide protection and adhesion enhancement.

Design and calculation topics

Covers verification, testing, thermal capacity, stopping distance extension, duty cycles and service braking calculations (see ISO 20138 references).

Practical applications and users

This standard is essential for:

Rolling stock designers and OEMs specifying brake architecture and safety redundancy

Railway operators and fleet engineers managing lifecycle requirements and maintenance strategies

Systems integrators implementing trainwide brake control, WSP and brake blending

Certification bodies, safety assessors and regulators assessing compliance and interoperability

Infrastructure managers and rescue planners verifying compatibility for rescue purposes

Related standards

ISO 20138 (Calculation of braking performance)

ISO 24478:2023 (Braking vocabulary)

ISO 4975 (Compressed air quality for pneumatic systems)

ISO 10516 (Vehicle reference masses)

ISO 24221:2024 provides the high‑level, safety‑focused framework for brake system design and operation; pair it with performance and calculation standards (e.g., ISO 20138) for a complete braking specification and compliance strategy.

ISO 24221:2024 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

ISO 24478:2023

Railway applications — Braking — General vocabulary

ISO 20138-2:2019

Railway applications — Calculation of braking performance (stopping, slowing and stationary braking) — Part 2…

BS ISO 4975:2022

Railway applications - Braking system - Quality of compressed air for pneumatic apparatus and systems

ISO 10516:2025

Railway applications — Vehicle reference masses