TC 9 - Electrical equipment and systems for railways

IEC 63341-3:2025 specifies the performance evaluation methodologies for fuel cell power systems that are designed for utilisation in electrically propelled rolling stock.
The scope of this document concerns itself exclusively with electrically powered rolling stock. Internal combustion engines utilising hydrogen are not encompassed within the scope of this document.
This document is applicable to hydrogen fuel cell power systems for electrically propelled rolling stock.
This document does not apply to reformer-equipped fuel cell power systems.
This document does not cover the hydrogen fuel systems that are permanently or separately attached to either the rolling stock or the fuel cell power system. These systems are addressed in IEC 63341-2. The fundamental system overview, incorporating the interrelationships between the primary functions and the connections to the external system, is delineated in IEC 63341-1:2025, Figure 4.
The relevant standards are comprehensively delineated in IEC 63341-1. The performance targets for fuel cell power systems are agreed upon between the user and the manufacturer

IEC 63341-2:2025 applies to on-board hydrogen fuel systems (HFSs) used to supply the fuel cells for the traction power and the auxiliaries supply of railway vehicles (such as hybrid vehicles as defined in IEC 62864-1).
This document applies to hydrogen storage in gaseous form. Other means of storage (such as liquid, liquid cryo-compressed, metal hydrides) are not covered in this document.
This document applies to any rolling stock type (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives).
This document addresses the on-board mechanical, fluidic and electrical interfaces between the on-board hydrogen fuel system and fuelling station. The fuelling station, fuelling protocol and communication for the fuelling protocol are not in the scope of this document.
This document defines:
– the scope of supply of hydrogen fuel system and the description of the interfaces with sub systems internal and external to the rolling stock such as fuel cell power system, fuelling station systems;
– the environmental constraints;
– the design requirements to support HFS compliance with railway applications;
– the safety and reliability requirements to design and install the HFS for railway applications;
– the marking and labelling requirements;
– the requirements related to storage, transportation, installation and maintenance;
– the validation (type, routine and investigation tests) requirements.

IEC 63341-1:2025 applies to fuel cell power systems installed onboard rolling stock for railway applications (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives). Fuel cell power systems specified in this document are used for the traction power and the auxiliary supply of railway vehicles such as hybrid vehicles, and in case of use as an auxiliary onboard power source. This document applies to the fuel cell technology called proton exchange membrane fuel cell (PEMFC), with the use of hydrogen as fuel source and the use of air as oxidant source. This document does not apply for hydrogen fuel system which is specified in IEC 63341-2, as HFS is not within the scope of this document. This document does not apply for power conversion equipment which is specified in IEC 61287-1 and is not within the scope this document.
This document specifies:
- the scope of supply and the description of the interfaces (fluidic, electrical, thermal and mechanical) of the fuel cell power system;
- the description of the environmental conditions;
- the specification and description of all the requirements to ensure the fuel cell power system conformance with a railway application;
- the process to validate the fuel cell power system sizing required for a specific load profile;
- the safety, reliability and protection requirements to design the fuel cell power system for a railway application;
- the marking and labelling requirements;
- the requirements related to storage, transportation, installation and maintenance;
- the tests (type, routine and investigation) required to validate the fuel cell power system.

IEC 62278-2:2025 considers the safety-related generic aspects of the RAMS life cycle and defines methods and tools which are independent of the actual technology of the systems and subsystems.
This document provides:
a) methods for the understanding of the systems approach to safety which is a key concept of IEC 62278;
b) methods to derive the safety requirements and their safety integrity requirements for the system and to apportion them to the subsystems;
c) methods to derive the safety integrity levels (SIL) for the safety-related electronic functions;
d) guidance and methods for the following areas:
1) safety process;
2) safety demonstration and acceptance;
3) organization and independence of roles;
4) risk assessment;
5) specification of safety requirements;
6) apportionment of functional safety requirements;
7) design and implementation;
e) the user of this document with the methods to assure safety with respect to the system under consideration and its interactions;
f) guidance about the definition of the system under consideration, including identification of the interfaces and the interactions of this system with its subsystems or other systems, in order to conduct the risk analysis.
This document does not specify:
g) RAMS targets, quantities, requirements or solutions for specific railway applications;
h) rules or processes pertaining to the certification of railway products against the requirements of this document;
i) an approval process by the safety authority.
This document is applicable:
j) to the specification and demonstration of RAMS for all railway applications and at all levels of such an application, as appropriate, from complete railway systems to major systems and to individual and combined subsystems and components within these major systems, including those containing software; in particular:
1) to new systems;
2) to new systems integrated into existing systems already accepted, but only to the extent and insofar as the new system with the new functionality is being integrated. It is otherwise not applicable to any unmodified aspects of the existing system;
3) as far as reasonably practicable, to modifications and extensions of existing systems already accepted, but only to the extent and insofar as existing systems are being modified. It is otherwise not applicable to any unmodified aspect of the existing system;
k) at all relevant phases of the life cycle of an application;
l) for use by railway duty holders and the railway suppliers.
This document is not applicable to:
m) any unmodified aspect of the existing system;
n) existing systems which remain unmodified, including those systems already compliant with IEC 62278:2002.
IEC 62278-2:2025, together with IEC 62278-1, cancels and replaces IEC 62278:2002. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) creation of this new Part 2 providing, for the first time, safety-related guidance and methods that support the safety management process provided in IEC 62278-1:2025.
The IEC 62278 series forms part of the railway sector specific application of IEC 61508. IEC 62278, IEC 62279 and IEC 62425 comprise the railway sector equivalent of the IEC 61508 series so far as railway communication, signalling and processing systems are concerned. When compliance with these documents has been demonstrated, further evaluation of compliance with the IEC 61508 series is not foreseen. A list of all parts in the IEC 62278 series, published under the general title Railway applications - Specification and demonstration of reliability, availability, maintainability and safety (RAMS), can be found on the IEC website.

IEC 62278-1:2025 addresses railway specifics, enables conflicts between RAMS elements to be controlled and managed effectively.
This document specifies:
a) a process, based on the system life cycle and tasks within it, for managing RAMS;
b) a systematic process, tailorable to the type and size of the system under consideration, for specifying requirements for RAMS and demonstrating that these requirements are achieved.
This document does not specify:
c) RAMS targets, quantities, requirements or solutions for specific railway applications;
d) rules or processes pertaining to the certification of railway products against the requirements of this document;
e) an approval process for the railway stakeholders.
This document is applicable to railway application fields, including signalling, rolling stock and fixed installations, and specifically:
f) to the specification and demonstration of RAMS for all railway applications and at all levels of such an application, as appropriate, from complete railway systems to major systems and to individual and combined subsystems and components within these major systems, including those containing software; in particular:
- to new systems;
- to new systems integrated into existing systems already accepted, but only to the extent and insofar as the new system with the new functionality is being integrated. It is otherwise not applicable to any unmodified aspects of the existing system;
- as far as reasonably practicable, to modifications and extensions of existing systems already accepted, but only to the extent and insofar as existing systems are being modified. It is otherwise not applicable to any unmodified aspect of the existing system;
g) at all relevant phases of the life cycle of an application;
h) for use by railway duty holders and the railway suppliers.
This document is not applicable to:
i) any unmodified aspects of the existing system;
j) existing systems which remain unmodified, including those systems already compliant with IEC 62278:2002.
This first edition, together with IEC 62278-2, cancels and replaces IEC 62278:2002. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) added 5.2 on multi level system approach;
b) added 5.3 on railway system overview;
c) added 5.9 on risk reduction strategy;
d) updated the content of correlation of RAMS management process and system life cycle in 6.2;
e) added 6.4 on organizational requirements;
f) added 6.5 on application of this document and adaptability to project scope and size;
g) added 6.8 on independent safety assessment;
h) added Clause 8 on safety case;
i) added Annex D providing guidance on system definition;
The IEC 62278 series forms part of the railway sector specific application of IEC 61508. IEC 62278, IEC 62279 and IEC 62425 comprise the railway sector equivalent of the IEC 61508 series so far as railway communication, signalling and processing systems are concerned. When compliance with these documents has been demonstrated, further evaluation of compliance with the IEC 61508 series is not foreseen. A list of all parts in the IEC 62278 series, published under the general title Railway applications – Specification and demonstration of reliability, availability, maintainability and safety (RAMS), can be found on the IEC website.

IEC 63536:2025 specifies minimum functional requirements for urban rail signalling and control systems (for use in urban guided passenger transport lines and networks)
- which operate on line-of-sight or using automatic interlock signalling with intermittent supervision,
- not covered by the existing UGTMS standard IEC 62290 series, and
- not forming a part of an urban traffic control system but possibly interfaced with such systems.
The document is restricted to minimum functional requirements which allow users to define more specific requirements based on the given framework of the system requirements at top level. This document is not applicable to command and control systems for urban rail using continuous data transmission and continuous supervision of train movements by train protection profile (already covered by the IEC 62290 series).

IEC 62590-1:2025 specifies the common requirements and definitions for all power converter applications in fixed installations for power supply of railway systems.
This document applies to fixed installations of following electric traction systems:
railway networks,
metropolitan transport networks including metros, tramways, trolleybuses and fully automated transport systems, magnetic levitated transport systems, electric road systems.
This document applies to AC/DC converters, DC converters and AC converters. Converters for improvement of power quality and for energy saving are also included.
Converters connected to electric traction systems feeding 3AC, 1AC or DC systems for auxiliary purpose are not in the scope of this document but some aspects such as insulation coordination and railway specific conditions can be referred to.
This document, in conjunction with the other parts of IEC 62590, cancels and replaces IEC 62589:2010 and the former IEC 62590:2019.
This document includes the following significant technical changes with respect to IEC 62589:2010 and the former IEC 62590:2019:
a) Split into common requirements and special requirements for different converters;
b) Interface Model for the different systems connected;
c) Split into circuits with their requirements like insulation coordination;
d) Energy efficiency addressed.

IEC 62425:2025 is applicable to safety-related electronic systems (including subsystems and equipment) for railway signalling applications. This document applies to generic systems (i.e. generic products or systems defining a class of applications), as well as to systems for specific applications. The scope of this document, and its relationship with other IEC and CENELEC standards, are shown in Figure 1. This document is applicable only to the functional safety of systems. It does not deal with other aspects of safety such as the occupational health and safety of personnel. While functional safety of systems clearly can have an impact on the safety of personnel, there are other aspects of system design which can also affect occupational health and safety and which are not covered by this document. Cybersecurity aspects of functional safety are addressed only to a limited extent. This document applies to all the phases of the life cycle of a safety-related electronic system, focusing in particular on phases 5 (architecture and apportionment of system requirements) to 10 (system acceptance) as defined in IEC 62278-1: -
Requirements for systems which are not related to safety are outside the scope of this document. This document is not applicable to existing systems, subsystems or equipment which had already been accepted prior to the development of this document. However, so far as reasonably practicable, it is applicable to modifications and extensions to existing systems, subsystems and equipment. This document is primarily applicable to systems, subsystems or equipment which have been specifically designed and manufactured for railway signalling applications. It is also applicable, so far as reasonably practicable, to general-purpose or industrial equipment (e.g. power supplies, display screens or other commercial off the shelf items), which is procured for use as part of a safety-related electronic system. This document is aimed at railway duty holders, railway suppliers, and assessors as well as at safety authorities, although it does not define an approval process to be applied by the safety authorities. 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) a better alignment with the life cycle phases defined in IEC 62278-1 has been made;
b) Clause 5 describes the requirements that apply to the development of safety-related electronic systems (until phase 9 of the life cycle);
c) Clause 8 focuses on the requirements for safety acceptance and approval of safety-related electronic systems and subsequent phases;
d) requirements and guidance have been added in Clause 6 on the following topics:
- reuse of pre-existing systems,
- safety-related tools,
- impact of cybersecurity threats on functional safety,
- specific application safety cases;
e) requirements for the structure and content of the safety case are now defined in a dedicated Clause 7;
f) Annex A has been updated for the specification and allocation of safety integrity requirements;
g) the content of former Annex D has been merged with Annex B, and the content has been changed from informative to normative;
h) the status of Annex E has been changed from informative to normative;
i) an Annex F has been added as an informative annex on User Programmable Integrated Circuits.
A more detailed comparison of changes between IEC 62425:2007 and this document can be found in Annex G.

IEC 62290-2:2025 specifies the functional requirements of UGTMS (urban guided transport management and command/control systems) for use in urban guided passenger transport lines and networks. This document is applicable for new lines or for upgrading existing signalling and command control systems.
The IEC 62290 series specifies the functional, system and interface requirements for the command, control, and management systems intended to be used on urban, guided passenger transport lines and networks.
These systems are designated herein as urban guided transport management and command/control systems (UGTMS). UGTMS cover a wide range of operations needs from non-automated (GOA1) to unattended (GOA4) operation. A line may be equipped with UGTMS on its full length or only partly equipped.
The IEC 62290 series does not specifically address security issues. However, aspects of safety requirements may apply to ensuring security within the urban guided transit system.
The main objectives of this series are as follows:
* to provide a baseline system description and functional requirements specification for a transport authority to use in a request for proposal,
* to provide recommendations for those transport authorities wishing to acquire an interoperable or interchangeable system.
It is the responsibility of the transport authority concerned to decide on how to apply the IEC 62290 series and to take into account their particular needs.
This document is applicable to applications using
* continuous data transmission,
* continuous supervision of train movements by train protection profile, and
* localisation of trains by onboard UGTMS equipment (reporting trains), and optionally by external wayside (and optionally onboard) device.
In this document, the functional requirements set the framework to which detailed functions are added to define any generic or specific application.
Because of that, although this document is applicable as a basis to define SRS, FIS and FFFIS, elements can be added for a generic or specific application.
This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the functions 5.1.4.5 Stopping a train en route, 5.1.5.4 Monitor speed limit at discrete location, 5.5.5 Manage UGTMS transfer tracks, 5.6.4.1 Monitor passenger emergency calls and 6.2.4 Ensure connecting services have been deleted;
b) the functions 5.5.11 Manage train washing, 5.5.12 Manage non-stopping areas and 6.3.4 Perform progressive shutdown have been added;
c) many of the requirements have been reworded: changes in their wording could be only minor and editorial, or it could have technical consequences;
d) some requirements of the second edition have been moved from one function/subfunction to another;
e) some requirements have been deleted;
f) some new requirements have been added in the existing functions;
g) an informative annex giving the reader some user’s recommendations about this document has been added;
h) another informative annex giving some typical performance-related criteria has been also added.
i) an informative annex providing a summary of applicability of functions and subfunctions (mandatory or optional) depending on GOA has been added.
In order to avoid any disturbance in the use of the document, when functions or requirements of IEC 62290‑2:2014 have been deleted, their numberings have been kept on purpose in this document. The expression "Deleted" is indicated at the place of the former headlines of the deleted functions, or at the place of the wording of the deleted requirements. Therefore, the impacts on any existing references or traceability matrices defined previously to this third edition is limited as much as possible.
For readability of the text, just below the headline of functions and subfunctions describing requirem

IEC 62290‑1:2025 provides an introduction to the IEC 62290 series and deals with the main concepts, the system definition, the principles and the basic functions of UGTMS (urban guided transport management and command/control systems) for use in urban guided passenger transport lines and networks. This document is applicable for new lines or resignalling of existing lines.
This document is applicable to applications using:
- continuous data transmission,
- continuous supervision of train movements by train protection profile, and
- localisation of trains by onboard UGTMS equipment (reporting trains), and optionally by external wayside (and optionally onboard) device.
The IEC 62290 series specifies the functional, system and interface requirements for the command, control, and management systems intended to be used on urban, guided passenger transport lines and networks.
These systems are designated herein as urban guided transport management and command/control systems (UGTMS). UGTMS cover a wide range of operations needs from non-automated (GOA1) to unattended (GOA4) operation. A line may be equipped with UGTMS on its full length or only partly equipped.
The IEC 62290 series does not specifically address security issues. However, aspects of safety requirements may apply to ensuring security within the urban guided transit system.
The main objectives of this series are as follows:
- to provide a baseline system description and functional requirements specification for a transport authority to use in a request for proposal,
- to provide recommendations for those transport authorities wishing to acquire an interoperable or interchangeable system.
It is the responsibility of the transport authority concerned to decide on how to apply the IEC 62290 series and to take into account their particular needs.
This document is applicable to applications using:
- continuous data transmission,
- continuous supervision of train movements by train protection profile, and
- localisation of trains by onboard UGTMS equipment (reporting trains), and optionally by external wayside (and optionally onboard) device.
This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Figure 3, giving the system environment of UGTMS, has been amended to reflect the adaptation of it;
b) external equipment for which no requirement is described in the IEC 62290 series has been removed;
c) new external equipment having such requirements (like the washing machine) has been added.

IEC 62290‑3:2025 specifies the system architecture for urban guided transport management and command/control systems (UGTMS) as defined in IEC 62290‑1 and IEC 62290‑2, and the allocation of functions and requirements defined in IEC 62290‑2 to the different UGTMS subsystems (designated as system constituents in IEC 62290‑1 and IEC 62290‑2), for use in urban guided passenger transport lines and networks.
The IEC 62290 series specifies the functional, system and interface requirements for the command, control, and management systems intended to be used on urban, guided passenger transport lines and networks.
These systems are designated herein as urban guided transport management and command/control systems (UGTMS). UGTMS cover a wide range of operations needs from non-automated (GOA1) to unattended (GOA4) operation. A line may be equipped with UGTMS on its full length or only partly equipped.
The IEC 62290 series does not specifically address security issues. However, aspects of safety requirements may apply to ensuring security within the urban guided transit system.
The main objectives of this series are as follows:
* to provide a baseline system description and functional requirements specification for a transport authority to use in a request for proposal,
* to provide recommendations for those transport authorities wishing to acquire an interoperable or interchangeable system.
It is the responsibility of the transport authority concerned to decide on how to apply the IEC 62290 series and to take into account their particular needs.
The IEC 62290 series is also intended to support applications for upgrading existing signalling and command control systems. In this case, interchangeability and compatibility could be ensured only for the additional UGTMS equipment. Checking the possibility for upgrading existing equipment and the level of interoperability is the responsibility of the transport authority concerned.
This document is applicable for new lines or for upgrading existing signalling and command control systems.
This document is applicable to applications using
* continuous data transmission,
* continuous supervision of train movements by train protection profile, and
* localisation by onboard UGTMS equipment (reporting trains), and optionally by external wayside (and optionally onboard) device.
The functional allocations of the UGTMS subsystems are mandatory (forming a sort of core system) or optional, according to the mandatory/optional functions and requirements defined in IEC 62290‑2.
This document is applicable as a basis to define FIS and FFFIS. For specific applications, some elements can be added to meet the requirements coming from additional functions or equipment.
This second edition cancels and replaces the first edition published in 2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the last maintenance of IEC 62290‑1 is taken into account, in particular the changes made for describing the external environment of UGTMS;
b) the last maintenance of IEC 62290‑2 is taken into account, as IEC 62290‑3 is using the requirements defined in the latter. Therefore, the document reflects the deleted functions and requirements in IEC 62290‑2, and also the new functions and requirements.

IEC 63453:2025 specifies functional requirements for the validation of simulation techniques and tools used to assess the dynamic interaction between overhead contact lines and pantographs, as part of the prediction of current collection quality, to ensure confidence in, and mutual acceptance of the results of the simulations.
This document deals with:
- input and output parameters of the simulation;
- comparison with line test measurements, and the characteristics of those line tests;
- validation of pantograph models;
- comparison between different simulation tools;
- limits of application of validated methods to assessments of pantographs and overhead contact lines.
This document applies to the current collection from an overhead contact line by pantographs mounted on railway vehicles. It does not apply to trolley bus systems.

IEC 63438:2024 applies to the electrical protection system, provided for AC and DC electric traction power supply systems. It:
– establishes railway specific protection principles;
– describes the railway specific protection system functionality;
– specifies minimum functional requirements and informative examples of their application;
– establishes limitations of the protection system and the acceptability of residual risks;
– specifies principles for design verification.
This document is applicable to:
– railways;
– guided mass transport systems, such as tramways, elevated and underground railways, mountain railways, trolleybus systems, and magnetically levitated systems which use a contact line system.
This document can also be applied to electrified road traffic with a contact line, such as truck-trolley systems.
This document applies to new electric traction power supply systems and can be applied to changes of existing systems.
This document does not apply to:
– underground mine traction systems;
– cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the contact line system and are not endangered by the traction power supply system;
– suspended cable cars;
– funicular railways;
– magnetic levitated systems (without a contact line system);
– railways with an inductive power supply without contact system;
– railways with a buried contact system that is required to be energized only below the train to ensure safety.
This document does not cover:
– technical requirements for products, e.g. protection devices;
– rules for maintenance of protection 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.

IEC 62973-3:2024 establishes the framework for the selection and operation of lead acid batteries of the VRLA type for auxiliary power supply systems on rolling stock of railways and complements IEC 62973-1, unless otherwise specified. This document provides guidance and links to standards for the required battery qualification tests procedures and safety measures to be implemented. In this document, the most appropriate clauses of these cited standards have been selected and adapted as needed to reflect the intended use of these batteries as auxiliary power sources on rolling stock of railways.
The battery-specific requirements for subcomponents of battery systems such as containers, charging controls, temperature probes, nameplates and similar are covered in this document as needed.
Charging systems are excluded from the scope of this document.

IEC 60913:2024 specifies the requirements and tests for the design of overhead contact line systems, requirements for structures and their structural calculations and verifications as well as the requirements and tests for the design of assemblies and individual parts. This document is applicable to electric traction overhead contact line systems in heavy railways, light railways, for trolley bus lines, electric road systems (Annex E) and industrial railways of public and private operators. This document is applicable to new installations of overhead contact line systems and for the complete renewal of existing overhead contact line systems. The European standard EN 50119 has served as a basis for the elaboration of this document. This edition includes the following significant technical changes with respect to the previous edition:
a) title modified;
b) requirements for urban rail systems are included;
c) requirements for rigid overhead contact line (ROCL) are included;
d) additional definitions for new terms are included (Clause 3);
e) clearances and geometry of overhead contact line are improved (Clause 5);
f) urban aspects are added, for example wall anchors (Clause 6);
g) requirements for monitoring devices, automatic earthing and short-circuiting equipment are included (Clause 7);
h) requirements for overhead contact line for electric vehicles with pantograph on electrified roads are added (Annex E)
i) improvements on the basis of EN 50119:2020 and the questionnaire 9/2619A/Q

IEC 63190:2023 specifies the characteristics of copper and copper alloy catenary wires for use on overhead contact lines. This document also covers auxiliary catenary wires. It establishes the product characteristics, the test methods, checking procedures to be used with the catenary wires, together with packing, ordering and delivery conditions.

IEC 62973-5:2023 applies to lithium-ion batteries for auxiliary power supply systems used on rolling stock. This document specifies the requirements of the characteristics and tests for the lithium-ion cells, and supplements IEC 62973-1 which is applied to any rolling stock types (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives, etc.). This document specifies the requirements of the interface between battery system including BMS and the converter. This document is used in conjunction with generic IEC 62619 (safety requirements) and IEC 62620 (performance requirements) of lithium-ion cells and batteries used in industrial applications. This document specifies the requirements for railway rolling stock applications.

IEC 63076:2019 applies to electrical systems aboard vehicles of the trolley bus type, as defined in 3.1, fed with a nominal line voltage (Un) between 600 V DC and 750 V DC. This document defines the requirements and constructional advice, especially to avoid electrical danger to the public and to staff. Where special requirements exist for trolley buses, advice is given for mechanical and functional safety, as well as for protection against fire. This publication is based on EN 50502:2015. This document covers vehicles intended for public transportation. This document applies to:
- trolley buses without on-board isolation interface from the contact line,
- buses with a current rail for guidance in the road surface,
- guided buses with bipolar roof current collectors.

IEC 62590-3-1:2022 specifies the requirements and test methods for electronic power compensators for 1AC traction systems. This equipment is used to improve electric power quality inside the electric traction system and/or at the interface to the 3AC power network, applying power electronics technology.
This document applies to equipment which is installed to achieve one or more of the following objectives as its function(s):
- to mitigate voltage fluctuation;
- to improve power factor;
- to reduce imbalance at the interface to the 3AC power network.
This document applies to equipment with all possible configurations to implement different technical solutions for compensation, but equipment consisting of only passive components is excluded.

IEC 62499:2021 gives rules for testing methods for newly manufactured pantographs contact strips. Not all tests may be relevant to some designs of contact strips. This document excludes tests using a particular pantograph. Additional supplementary tests, out of the scope of this document, may be necessary to determine suitability for a particular application and are by prior agreement between customer and manufacturer.
It is based on EN 50405:2015. This second edition cancels and replaces the first edition published in 2008. This edition includes the following significant technical changes with respect to the previous edition:
a. Title modified;
b. The scope of this standard is changed from carbon contact strips to contact strips;
c. Replacement of several reference standards;
d. Several terms and abbreviated terms are introduced;
- The definitions of metalized contact strip and metal contact strip are introduced according to the metal or carbon content by weight;
- The definitions of contact strip structures and types are introduced;
e. Requirements for data sheets are introduced;
f. Table 1: Schedule of tests and Table 2: Sequence of tests are introduced;
g. the requirements for certain test methods and test acceptance criteria are updated;
h. Test of metal content for metalized contact strip, test of the coefficient of friction, optional test of the impact resistance of the carbon material and optional test of wear properties are added;
- Annex A and Annex B are introduced.

IEC 61375-2-8:2021 applies to all equipment and devices implemented according to IEC 61375-2-3:2015, IEC 61375-2-5:2014 and IEC 61375-3-4:2014, i.e. it covers the procedures to be applied to such equipment and devices when the conformance should be proven. The applicability of this document to a TCN implementation allows for individual conformance checking of the implementation itself, and is a pre-requisite for further interoperability checking between different TCN implementations.

IEC 62973-4:2021 applies to secondary sealed nickel-metal hydride battery technologies for auxiliary power supply systems used on rolling stock.
This document specifies the requirements of the characteristics and tests for the sealed nickel-metal hydride cells and supplements IEC 62973-1 which applies to any rolling stock types (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives, etc.). Unless otherwise specified, the requirements of IEC 62973-1 apply. This document also specifies the requirements of the interface between the batteries and the battery chargers. This document is to be used in conjunction with IEC 62675, IEC 63115-1 and IEC 63115-2.

IEC 62973-2:2020 applies to NiCd rechargeable batteries for auxiliary power supply systems used on railway vehicles. It is an extension of IEC 62973-1:2018 which specifies common requirements for all battery technologies of other parts of IEC 62973. Unless otherwise specified, the requirements of IEC 62973-1:2018 apply.
Battery systems described in this document are used in conjunction with charging systems onboard rolling stock, as described in IEC 62973-1:2018. Charging systems (e.g. LVPS, converters, etc.) are excluded from the scope of this document.
This document also specifies the design, operation parameters, safety recommendations, routine and type tests, as well as marking and designation. This document is used in addition to IEC 60623:2017 or IEC 62259:2003 for NiCd Cells.

IEC 62505-3-1:2020 is applicable to new low voltage devices for measurement, control and protection which are:
- for indoor or outdoor fixed installations in traction systems, and
- operated in conjunction with high voltage equipment with an AC line voltage and frequency as specified in IEC 60850.
This document also applies to measurement, control and protective devices other than low voltage devices and not covered by a specific railway product standard as far as reasonably possible. Requirements of this document prevail.
This second edition cancels and replaces the first edition published in 2009.  This edition includes the following significant technical changes with respect to the previous edition:
- distinguish between requirements and application guides
- include requirements on devices for example control and protection relays not included before;
- remove parts already included in other standards, for example EN 50633 for protection principles, which is intended to become an IEC standard.

IEC 62505-3-2:2020 is applicable to new current transformers which are:
- intended for use in indoor or outdoor fixed installations in traction systems, and
- operated with an AC line voltage and frequency as specified in IEC 60850.
This second edition cancels and replaces the first edition published in 2009.This edition includes the following significant technical changes with respect to the previous edition :
- this standard was revised to reflect the latest versions of standards referenced and to remove text already included in the IEC 61869 series.
- the structure of the document was adapted to that of IEC 62505‑1 and IEC 62505‑2.
- ratings have been added to provide designations in line with other railway standards, for example IEC 62497.
- test requirements have been detailed to meet operating conditions of railway applications.
- partial discharge voltages have been specified.

IEC 62505-3-3:2020 is applicable to new voltage transformers which are:
- intended for use in indoor or outdoor fixed installations in tractions systems, and
- operated with an AC line voltage and frequency as specified in IEC 60850.
This document also applies to voltage transformers other than inductive types as far as reasonably possible. Requirements of this document have priority.
This second edition cancels and replaces the first edition published in 2009. This edition includes the following significant technical changes with respect to the previous edition:
This standard was revised to reflect the latest versions of standards referenced and to remove text already included in the IEC 61869 series.
The structure of the document was adapted to that of IEC 62505‑1 and IEC 62505‑2.
Ratings have been added to provide designations in line with other railway standards, for example IEC 62497.
Tests requirements have been detailed to meet operating conditions of railway applications.
Partial discharge voltages have been specified

IEC 60077-5:2019 give additional or amended rules for high voltage (HV) fuses as a supplement to those given by IEC 60077-2. The high voltage fuses concerned are those connected into power and/or auxiliary circuits. The nominal voltage of these circuits lies between 600 V DC and 3 000 V DC, according to IEC 60850. These fuses can also be used in auxiliary AC circuits up to a nominal voltage of 1 500 V. This document together with IEC 60077-2 states specifically:
a) the characteristics of the fuses;
b) the service conditions with which the fuses comply with reference to:
- operation and behaviour in normal service;
- operation and behaviour in case of short circuit;
- dielectric properties.
c) the tests intended for confirming the compliance of the fuse with the characteristics under the service conditions and the methods adopted for these tests;
d) the information marked on, or given with, the fuse.
This second edition cancels and replaces the first edition, issued in 2003. This edition includes the following main technical changes with regard to the previous edition:
a) test method of test duty III for verification of breaking capacity is reviewed.

IEC 60077-3:2019 gives the rules for circuit-breakers, the main contacts of which are connected to DC power and/or auxiliary circuits. The nominal voltage of these circuits does not exceed 3 000 V DC according to IEC 60850. This part of IEC 60077, together with IEC 60077-2, states specifically:
a) the characteristics of the circuit-breakers;
b) the service conditions with which circuit-breakers complies with reference to:
- operation and behaviour in normal service;
- operation and behaviour in the case of short circuit
- dielectric properties;
c) the tests for confirming the compliance of the components with the characteristics under the service conditions and the methods to be adopted for these tests;
d) the information to be marked on, or given with, the circuit breaker.
This second edition cancels and replaces the first edition, issued in 2001. This edition includes the following main technical changes with regard to the previous edition:
- procedure of verification of temperature rise is changed;
- air-tightness test as type test, insulation resistance measurement are added.

IEC 60077-4:2019 gives rules for AC circuit-breakers, the main contacts of which are connected to AC overhead contact lines; the nominal voltage of these circuits being in accordance with IEC 60850. This document, together with IEC 60077-2, states specifically:
a) the characteristics of the circuit-breakers;
b) the service conditions with which circuit-breakers comply with reference to:
- operation and behaviour in normal service;
- operation and behaviour in short-circuit;
- dielectric properties;
c) the tests for confirming the compliance of the components with the characteristics under the service conditions and the methods to be adopted for these tests
d). the information to be marked on, or given with the circuit-breaker.
This second edition cancels and replaces the first edition, issued in 2003. This edition includes the following main technical changes with regard to the previous edition:
a) standard values of transient recovery voltages and test procedure are reviewed;
b) procedure of verification of temperature rise is changed;
c) air-tightness test as type test, insulation resistance measurement are added

IEC 62290-3:2019 specifies the system architecture for Urban Guided Transport Management and Command/Control systems (UGTMS) as defined in IEC 62290-1 and IEC 62290-2, and the allocation of functions and requirements defined in IEC 62290-2 to the different UGTMS subsystems (designated as system constituents in IEC 62290-1 and IEC 62290-2), for use in urban guided passenger transport lines and networks. This document is applicable for new lines or for upgrading existing signalling and command control systems.
This document is applicable to applications using:
- continuous data transmission
- continuous supervision of train movements by train protection profile
- localisation by reporting trains, and optionally by external wayside equipment for non-reporting ones (e.g. in case of mixed operation or degraded operation)
This document is applicable as a basis to define FIS and FFFIS. For specific applications, some elements may be added to meet the requirements coming from additional functions or equipment.
The contents of the corrigendum 1 of June 2020 have been included in this copy.

IEC 62590:2019 specifies the requirements for the performance of all fixed installations electronic power converters, using controllable and/or non-controllable electronic valves, intended for traction power supply. The devices can be controlled by means of current, voltage or light. Non-bistable devices are assumed to be operated in the switched mode.
This document applies to fixed installations of the following electric traction systems:
- railways,
- guided mass transport systems such as: tramways, light rail systems, elevated and underground railways, mountain railways, trolleybuses.
This standard is based on EN 50328. This second edition cancels and replaces the first edition published in 2010. This edition includes the following significant technical changes with respect to the previous edition:
a) Incorporation of DC converters.
b) Correction of the clearances and withstand voltages due to erroneous use of PD in former edition.
c) adaption of structure, adaption of vocabulary, removal of unused term and abbreviations.

IEC 62912-2:2019 gives requirements for direct current relays intended for safety-related applications in railway signalling installations.
This document is applicable to non-proved signalling monostable relays of the spring type, whose return force is generated by elasticity of spring.
The return force can be provided either from a separate spring and/or from the contact springs themselves.

IEC 62597:2019 is limited to apparatus, systems and fixed installations which are intended for use in the railway environment. The frequency range covered is 0 Hz to 300 GHz.
Technical considerations and measurements are specified for frequencies up to 20 kHz because no relevant field strengths are expected above due to the physical nature of EMF‑sources in the railway environment.
The object of this document is to provide measurement and calculation procedures of electric and magnetic field levels generated by electronic and electrical apparatus in the railway environment with respect to human exposure.
The regulations regarding the protection of human beings during exposure to non-ionizing electromagnetic fields in the railway environment are different within the countries worldwide. This document offers a procedure regarding measurement, simulation/calculation and evaluation.
The measurement procedures and points of measurement cover also the aspect of persons bearing active implantable medical devices. This document does not apply to the risk assessment for persons bearing active implants in magnetic field generated by electronic and electrical apparatus in the railway environment.
This first edition cancels and replaces IEC TS 62597 published in 2011. This edition includes the following significant technical changes with respect to the Technical Specification:
a) Clause 3.1: The extent of “Terms and definitions” has been updated
b) Clause 3 was expanded by clause 3.2 “abbreviated terms”
c) Clause 4.2: The “surface method” for Rolling Stock measuement was deleted. Mandatory measurement method is former “volume method” with slightly modified measurement heghts.
d) Clause 4.3: Japanese set of measurement heghts for fixed installations was deleted.
e) Clause 5.2 and new Annex B: Measurement technique for lower frequency range up to 5 Hz.
f) New Annex C: Consistency to IEC 62110 in some countries
g) Several editorial improvements have been included in the entire document

IEC 62848-2:2019 applies to Voltage Limiting Devices (VLDs) to be applied in DC traction systems in order to comply with protective provisions against electric shock from DC, and combined AC – DC voltages, in accordance with the IEC 62128 series, taking into account stray current provisions.
VLDs operate in such a way as to connect the track return circuit of DC railway systems to the earthing system or to conductive parts within the overhead contact line zone or current collector zone.

IEC 61991:2019 defines requirements applied in the design and manufacture of electrical installations and equipment to be used on rolling stock to protect persons from electric shocks. This document is applicable to rolling stock of rail transport systems, road transport systems if they are powered by an external supply (e.g. trolley buses), magnetically levitated transport systems, and to the electrical equipment installed in these systems. This second edition cancels and replaces the first edition, published in 2000. It is based on EN 50153:2014. This edition includes the following significant technical changes with respect to the previous edition:
a) replacement of several reference standards.
b) several terms and abbreviated terms are introduced;
c) special national conditions are included in annex

IEC 62888-6:2019 specifies the specific requirements for EMS to be used for benchmarking, daily energy consumption monitoring, technical research and development.
This document provides the requirements for monitoring consumed energy on board in daily services in an easy way and the measured data are applicable for general purposes in industry such as energy management, energy saving, etc. However, this document is not applicable for billing purposes.
The practical purposes in industrial fields are, e.g.:
a) monitoring daily energy consumption of vehicles
b) obtaining data on influential factors, such as operational commands and surrounding conditions, in order to analyse relations between operations and energy;
c) energy management of power flow between vehicles and fixed installations;
d) implementing investigation tests of research and development for vehicle systems;
e) energy cost forecasting for analysing overall efficiency and consumption.
The requirements specified in this document supplement and/or amend the requirements specified in IEC 62888-1 to IEC 62888-5.

IEC 62888-5:2018 specifies the conformance test arrangements for newly manufactured EMS (Energy management system) installed on a traction unit. This includes the integration conformance test and installation conformance test. In addition, this document also specifies the conformance test procedures for device and ancillary component replacement (e.g. due to damage in service), and periodic check to verify the EMS conformance test remains valid.

IEC 61375-2-6:2018 establishes the specification for the communication between the on-board subsystems and the ground subsystems. The communication system, interfaces and protocols are specified as a mobile communication function, using any available wireless technology. This document provides requirements in order to:
a) select the wireless network on the basis of QoS parameters requested by the application;
b) allow TCMS and;or OMTS applications, installed on-board and communicating on the on-board communication network, to have a remote access to applications running on ground installations;
c) allow applications running on ground installations to have a remote access to the TCMS and;or OMTS applications installed on-board.

IEC 62995:2018 specifies requirements for the installation of cabling on railway vehicles and within electrical enclosures on railway vehicles, including magnetic levitation trains and trolley buses. This document covers cabling for making electrical connections between items of electrical equipment, including cables, busbars, terminals and plug/socket devices. The material selection criteria given herein are applicable to cables with copper conductors.

IEC 62973-1:2018 applies to various rechargeable battery technologies for auxiliary power supply systems used on rolling stock (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives, etc.).
This document focuses on:
- the description of electrical interfaces for the following battery nominal voltages: 24 V, 32 V, 36 V, 48 V, 64 V, 72 V, 87 V, 96 V, 110 V;
- the description of electrical interfaces: considering battery load profile and battery capacity sizing parameters (e.g. operating voltage range and charging characteristics).
The main objective of this document is to achieve standardization of the electrical interfaces by considering various battery parameters in order to allow for calculating the battery capacity required for a specific load profile for the various battery technologies as detailed in the other parts of the standard.

IEC 62236-4:2018 specifies limits for emission and immunity and provides performance criteria for signalling and telecommunications (S&T) apparatus (including power supply systems belonging to S&T) which may interfere with other apparatus inside the railway environment, or increase the total emissions for the railway environment and so risk causing electromagnetic interference to apparatus outside the railway system. This new edition includes the following significant technical changes with respect to the previous edition: clarification of certain parts of the standard; extension of emission and immunity requirements.

IEC 62236-5:2018 applies to emission and immunity aspects of EMC for electrical and electronic apparatus and systems intended for use in railway fixed installations for power supply. This includes the power feed to the apparatus, the apparatus itself with its protective control circuits, trackside items such as switching stations, power autotransformers, booster transformers, substation power switchgear and power switchgear to other longitudinal and local supplies. This new edition includes the following significant technical changes with respect to the previous edition: clarification of certain parts of the standard; extension of emission and immunity requirements.

IEC 62236-3-1:2018 specifies the emission and immunity requirements for all types of rolling stock. It covers traction stock, hauled stock and trainsets including urban vehicles for use in city streets. This document specifies the emission limits of the rolling stock to the outside world. This new edition includes the following significant technical changes with respect to the previous edition: clarification of certain parts of the standard.

IEC 62236-3-2:2018 applies to emission and immunity aspects of EMC for electrical and electronic apparatus intended for use on railway rolling stock. IEC 62236‑3‑2 applies for the integration of apparatus on rolling stock. The objective of this document is to define limits and test methods for electromagnetic emissions and immunity test requirements in relation to conducted and radiated disturbances. This new edition includes the following significant technical changes with respect to the previous edition: clarification of certain parts of the standard; extension of emission and immunity requirements.