IEC 62427:2024

Railway applications - Compatibility between rolling stock and train detection systems

IEC 62427:2024 describes a process to demonstrate compatibility between rolling stock (RST) and train detection systems (TDS). It describes the characterization of train detection systems, rolling stock and traction power supply systems.
It is worth noting that the demonstration of technical compatibility between the rolling stock and infrastructure with respect to physical dimensions is not detailed in this document.
This document is not generally applicable to those combinations of rolling stock, traction power supply and train detection system which were accepted as compatible prior to the publication of this document. However, as far as is reasonably practicable, this document can be applied to modifications of rolling stock, traction power supply or train detection systems which can affect compatibility. The detailed process can be used where no rules and processes for compatibility are established.
This second edition cancels and replaces the first edition published in 2007. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) generic compatibility process, which is broken into a two-stage process depending on whether there are established compatibility limits or not;
b) rules for characterization of train detection systems;
c) rules for characterization of rolling stock;
d) rules for characterization of the power system;
e) informative references are provided in notes to established CENELEC standards for compatibility;
f) terminology is updated.

Applications ferroviaires - Compatibilité entre matériel roulant et systèmes de détection de train

General Information

• Status: Published
• Publication Date: 03-Dec-2024
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: TC 9 - Electrical equipment and systems for railways
• Drafting Committee: MT 62427 - TC 9/MT 62427
• Current Stage: PPUB - Publication issued
• Start Date: 25-Oct-2024
• Completion Date: 04-Dec-2024

Relations

• Revises: IEC 62427:2007 - Railway applications - Compatibility between rolling stock and train detection systems
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62427 ®
Edition 2.0 2024-12
INTERNATIONAL
STANDARD
Railway applications – Compatibility between rolling stock and train detection
systems
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews, graphical symbols and the glossary.
committee, …). It also gives information on projects, replaced With a subscription you will always have access to up to date
and withdrawn publications. content tailored to your needs.

IEC Just Published - webstore.iec.ch/justpublished
Electropedia - www.electropedia.org
Stay up to date on all new IEC publications. Just Published
The world's leading online dictionary on electrotechnology,
details all new publications released. Available online and once
containing more than 22 500 terminological entries in English
a month by email.
and French, with equivalent terms in 25 additional languages.

Also known as the International Electrotechnical Vocabulary
IEC Customer Service Centre - webstore.iec.ch/csc
(IEV) online.
If you wish to give us your feedback on this publication or need

further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 62427 ®
Edition 2.0 2024-12
INTERNATIONAL
STANDARD
Railway applications – Compatibility between rolling stock and train detection

systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 45.060.01  ISBN 978-2-8327-0024-2

– 2 – IEC 62427:2024 © IEC 2024
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 10
4 Compatibility process . 10
4.1 Overview. 10
4.2 Detailed compatibility process . 10
4.3 Building the compatibility argument . 11
4.4 Quality management . 12
4.5 Route identification for introduction of RST (new or changed) . 12
4.6 Introduction of infrastructure elements (new or changed) . 12
4.7 Characterization. 13
4.8 Compatibility analyses . 13
4.8.1 General terms . 13
4.8.2 Transfer function . 14
5 Characterization of train detection systems . 15
5.1 Objective of procedure . 15
5.2 Track circuit systems – Standards, regulations and technical specifications . 16
5.3 Axle counter systems – Standards, regulations and technical specifications . 16
5.4 Wheel detectors (treadle applications) . 16
5.4.1 General . 16
5.4.2 Wheel detectors based on inductive technology . 16
5.5 Loops. 17
5.5.1 General aspects . 17
5.5.2 Interfering mechanisms. 17
5.5.3 Characterization . 18
6 Characterization of rolling stock . 18
6.1 Objective . 18
6.2 General procedure . 18
7 Characterization of traction power supply systems . 19
7.1 Objective . 19
7.2 DC traction power supplies . 19
7.3 AC traction power supplies . 19
7.4 Test procedures . 20
8 Test report . 20
8.1 General . 20
8.2 Introduction to the report . 20
8.3 Test organization . 20
8.4 Configuration . 20
8.5 Reference documents . 20
8.6 Application of the test plan . 21
8.7 Test results . 21
8.8 Comments . 21

8.9 Archive of test results . 21
Annex A (informative) Guidelines for the determination of susceptibility of train
detection systems . 22
A.1 Examples of system configurations . 22
A.2 "Normal" configuration . 22
A.3 Interference mechanism with broken signal rail . 22
A.4 Interference mechanism with broken return rail . 23
A.5 Double rail track circuits . 24
A.6 Voltage between axles of rolling stock . 25
A.7 Effect of resistance between coupled vehicles . 26
A.8 Radiated interference . 28
A.9 Sensitive zone of wheel detector . 28
A.10 Factor of safety . 29
A.11 Multiple interference sources . 29
Annex B (informative) General characterization of rolling stock . 30
B.1 Objective of procedure . 30
B.2 Description of rolling stock and factors affecting its characteristics . 30
B.3 Configuration (design status) . 30
B.4 Test plan . 30
B.4.1 General . 30
B.4.2 Test site . 31
B.4.3 Instrumentation . 31
B.4.4 Test procedure . 31
Annex C (informative) Factors affecting rolling stock characteristics and compatibility . 33
Annex D (informative) DC traction power supplies . 36
D.1 General . 36
D.2 Interference currents generated by the rolling stock . 36
D.3 Interference currents generated by the traction power supply system . 36
Annex E (informative) Compatibility parameters for loops (European example) . 39
E.1 General . 39
E.2 Principles of operation – Electrical background . 39
E.3 Vehicle metal construction . 39
Bibliography . 42

Figure 1 – Sources of electromagnetic interference . 7
Figure 2 – The compatibility process . 11
Figure 3 – Relationship between compatibility limits and permissible interference . 15
Figure A.1 – Interference mechanism with rails intact . 22
Figure A.2 – Interference mechanism with self-revealing broken rail . 23
Figure A.3 – Interference mechanism with unrevealed broken rail . 23
Figure A.4 – Double rail track circuit . 24
Figure A.5 – Double rail track circuit with broken rail . 24
Figure A.6 – Interference mechanism due to voltage between axles – Case 1 . 25
Figure A.7 – Interference mechanism due to voltage between axles – Case 2 . 25
Figure A.8 – Effect of inter-vehicle current . 26
Figure A.9 – Equivalent circuit for Figure A.8 . 26
Figure A.10 – Example of radiated interference . 28

– 4 – IEC 62427:2024 © IEC 2024
Figure C.1 – Electrical bonding . 34
Figure D.1 – Rolling stock with DC supply . 37
Figure D.2 – Circulation of interference current generated by rolling stock . 37
Figure D.3 – Circulation of interference current generated by the substation . 38
Figure E.1 – Example of
...