EN ISO 24478:2024

SLOVENSKI STANDARD
01-junij-2024
Železniške naprave - Zavore - Slovar (ISO 24478:2023)
Railway applications - Braking - General vocabulary (ISO 24478:2023)
Bahnanwendungen - Bremsen - Fachbegriffe (ISO 24478:2023)
Applications ferroviaires - Freinage - Vocabulaire général (ISO 24478:2023)
Ta slovenski standard je istoveten z: prEN ISO 24478
ICS:
01.040.45 Železniška tehnika (Slovarji) Railway engineering
(Vocabularies)
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International
Standard
ISO 24478
First edition
Railway applications — Braking —
2023-08
General vocabulary
Corrected version
Applications ferroviaires — Freinage — Vocabulaire général
2024-04
Reference number
ISO 24478:2023(en) © ISO 2023
ISO 24478:2023(en)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
ISO 24478:2023(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Basic definitions .1
3.2 Brake system compatibility .1
3.3 Performance .2
3.4 Purposes of braking .2
3.5 Mechanics of braking .2
3.6 Kinematics and dynamics of braking .4
3.7 Types and characteristics of brakes .9
3.8 Brake application and release .11
3.9 Brake control. 12
3.9.1 General definitions . 12
3.9.2 Types of control . 13
3.9.3 Types of combined control .14
3.10 Brake system components .14
3.10.1 Components used for the command and control of braking .14
3.10.2 Sensors/indicators .16
3.10.3 Control assemblies .16
3.10.4 Brake control and/or system energy lines .17
3.10.5 Friction brake system components .18
3.10.6 Brake system energy storage . 20
3.10.7 Compressed air supply .21
3.10.8 Ancillary air system equipment .21
3.10.9 Hydraulic pressure supply . .21
3.10.10 Hand brake equipment. 22
3.10.11 Parking brake equipment . 22
3.11 Wheel slide protection (WSP). 22
3.12 Types of brake test . 23
4 Symbols and abbreviated terms.23
Annex A (informative) Delay time and build-up time for brake application .24
Annex B (informative) Delay time and release time for brake release .25
Annex C (informative) Brake chart .26
Annex D (informative) Overview of relationship between brake devices and signals .29
Annex E (informative) System set up and components .30
Bibliography .33

iii
ISO 24478:2023(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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This document was prepared by Technical Committee ISO/TC 269, Railway applications, Subcommittee SC 2,
Rolling stock.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
This corrected version of ISO 24478:2023 incorporates the following correction: footnotes "a" and "b" have
been replaced with the symbols "c" and "d", respectively, in Figure B.1.

iv
ISO 24478:2023(en)
Introduction
This document provides unambiguous definitions of generic terminology used in the field of railway braking.
The terms and definitions reflect those used in numerous published International Standards.
The braking includes all factors that have a bearing on the stopping, slowing or immobilization performance
of the train (e.g. train resistance, gradient) and may involve the conversion and dissipation of braking energy.

v
International Standard ISO 24478:2023(en)
Railway applications — Braking — General vocabulary
1 Scope
This document defines terms for brakes and braking in rolling stock.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 Basic definitions
3.1.1
braking
process generating controlled forces which result in the deceleration of the train, or maintaining a constant
speed on a falling gradient, or preventing a stationary train from moving
3.1.2
brake
brake system
combination of brake unit(s) (3.1.3) with their trainwide/local control device(s) ensuring one or more
braking function(s)
Note 1 to entry: Brakes and brake systems can also be used for other functions e.g. shunting, de-icing of friction brake units.
3.1.3
brake unit
device or assembly of components, that generates a braking force
Note 1 to entry: See Annex E.
Note 2 to entry: For tread brake and disc brake, it consists of the brake actuator, the friction material (pads or block)
and the disc (for disc brake units).
Note 3 to entry: The magnetic track brake (3.7.3.3) unit includes two magnet assemblies (one per rail).
Note 4 to entry: The primary purpose of the brake unit might not be to generate a braking force, for example elements
of the traction system can also function as a brake unit.
3.2 Brake system compatibility
3.2.1
brake system compatibility
ability of the brake systems of coupled rail vehicles/trains to achieve the specified levels of braking
performance, functionality and safety

ISO 24478:2023(en)
3.3 Performance
3.3.1
braking performance
parameters and their values used to quantify braking as described in applicable braking standards
3.3.2
deceler
...