FprEN IEC 63341-2:2025/prAA:2025
(Amendment)Railway applications - Hydrogen and fuel cell systems for rolling stock - Part 2: Hydrogen fuel system
Railway applications - Hydrogen and fuel cell systems for rolling stock - Part 2: Hydrogen fuel system
This document amends EN IEC 63341-2 which applies to onboard hydrogen fuel systems used to supply the fuel cells for the traction power and the auxiliaries supply of rolling stock vehicles (such as hybrid vehicles as defined in EN IEC 62864-1). NOTE 1 This document may also be used as informative recommendations for applications with hydrogen internal combustion engines. EN IEC 63341-2 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. EN IEC 63341-2 applies to any rolling stock type (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives). EN IEC 63341-2 addresses the 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. EN IEC 63341-2 defines: – the scope of supply of hydrogen fuel system (HFS) 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
Applications ferroviaires - Systèmes à hydrogène et à pile à combustible pour le matériel roulant - Partie 2: Système à hydrogène
Železniške naprave - Vodikovi sistemi in sistemi gorivnih celic za vozna sredstva - 2. del: Sistem za shranjevanje vodika - Dopolnilo AA
General Information
- Status
- Not Published
- Publication Date
- 30-Aug-2026
- Technical Committee
- CLC/TC 9X - Electrical and electronic applications for railways
- Drafting Committee
- WG 40 - Survey Group on the parallel vote of IEC 63341-2 ED1
- Current Stage
- 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
- Start Date
- 30-Jan-2026
- Due Date
- 02-Nov-2025
- Completion Date
- 30-Jan-2026
Relations
- Effective Date
- 14-Jan-2025
Overview
FprEN IEC 63341-2:2025/prAA:2025 is a crucial European draft amendment developed by CLC/TC 9X, focusing on safety, reliability, and technical requirements for hydrogen fuel systems in rolling stock. This standard amends EN IEC 63341-2 and is intended for onboard hydrogen fuel systems that supply fuel cells for both traction power and auxiliary systems in railway vehicles, including hybrids as per EN IEC 62864-1. It primarily addresses hydrogen storage in gaseous form and covers all types of rolling stock, such as light rail vehicles, trams, metros, regional and high-speed trains, and locomotives.
Key benefits of this standard include enhanced safety measures, structural design guidance, fire protection requirements, and maintenance protocols for the deployment of hydrogen technology in the railway sector.
Key Topics
- Scope of Supply and Interfaces
- Details the boundaries between the hydrogen fuel system (HFS), the rolling stock, fuel cell power systems, and external fuelling stations.
- Establishes requirements for mechanical, fluidic, and electrical interfaces.
- Environmental and Structural Requirements
- Specifies environmental constraints for system components.
- Structural design to be validated according to EN 12663-1 and welding requirements per EN 15085-4.
- Safety and Reliability
- Emphasizes leak detection and inspection using methods aligned with EN 1779.
- Outlines comprehensive fire protection requirements according to EN 45545-2 and fire resistance testing aligned with EN 1363-1, EN 1364-1, and EN 1364-2.
- Marking, Labelling, and Maintenance
- Mandates systematic marking and labelling for all HFS components.
- Defines robust maintenance activities, including visual inspections, leak tests, functional verifications, and periodic inspections using recognized standards like ISO 19078 and ISO 19880-1.
- Validation and Testing
- Requirements for type, routine, and investigation tests for HFS.
Applications
The FprEN IEC 63341-2:2025/prAA:2025 standard is highly relevant for a range of railway applications:
- Rolling Stock Manufacturers: Ensuring compliance from design through installation and operational phases of hydrogen-powered and hybrid rail vehicles.
- Maintenance Providers: Establishing effective maintenance plans, including preventive inspections, leak detection, and record-keeping.
- Railway Operators: Enhancing operational safety, reliability, and efficiency by following internationally recognized procedures for hydrogen fuel systems.
- Regulators and Assessors: Benchmarking compliance and validating rolling stock safety against Europe’s most current hydrogen standards.
- Hydrogen Technology Integrators: Facilitating safe integration of hydrogen storage and supply systems within the broader rail ecosystem.
Key focus is placed on gaseous hydrogen storage, routine inspections, fire protection, and standardized interfaces – all critical for the growth of sustainable, hydrogen-powered rail transport.
Related Standards
For comprehensive implementation, this standard should be used alongside other relevant railway and hydrogen technology standards, including:
- EN IEC 63341-1: Fuel cell power systems for rolling stock.
- EN 12663-1: Structural requirements for railway vehicle bodies.
- EN 15085-4: Welding requirements for railway vehicles.
- EN 45545-2: Fire protection for railway vehicles.
- EN 1779: Leak testing criteria.
- ISO 17268-4: Hydrogen refuelling receptacles.
- ISO 19880-1: Hydrogen refuelling station requirements.
- ISO 19078: In-service inspections for pressurized gas containers.
- EN 1363-1, EN 1364-1, EN 1364-2: Fire resistance tests for construction elements in rolling stock.
By adhering to FprEN IEC 63341-2:2025/prAA:2025, stakeholders across the rail industry can confidently address the challenges of integrating hydrogen fuel systems, leading to safer, greener, and more reliable passenger and freight transportation.
Frequently Asked Questions
FprEN IEC 63341-2:2025/prAA:2025 is a draft published by CLC. Its full title is "Railway applications - Hydrogen and fuel cell systems for rolling stock - Part 2: Hydrogen fuel system". This standard covers: This document amends EN IEC 63341-2 which applies to onboard hydrogen fuel systems used to supply the fuel cells for the traction power and the auxiliaries supply of rolling stock vehicles (such as hybrid vehicles as defined in EN IEC 62864-1). NOTE 1 This document may also be used as informative recommendations for applications with hydrogen internal combustion engines. EN IEC 63341-2 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. EN IEC 63341-2 applies to any rolling stock type (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives). EN IEC 63341-2 addresses the 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. EN IEC 63341-2 defines: – the scope of supply of hydrogen fuel system (HFS) 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
This document amends EN IEC 63341-2 which applies to onboard hydrogen fuel systems used to supply the fuel cells for the traction power and the auxiliaries supply of rolling stock vehicles (such as hybrid vehicles as defined in EN IEC 62864-1). NOTE 1 This document may also be used as informative recommendations for applications with hydrogen internal combustion engines. EN IEC 63341-2 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. EN IEC 63341-2 applies to any rolling stock type (e.g. light rail vehicles, tramways, streetcars, metros, commuter trains, regional trains, high speed trains, locomotives). EN IEC 63341-2 addresses the 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. EN IEC 63341-2 defines: – the scope of supply of hydrogen fuel system (HFS) 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
FprEN IEC 63341-2:2025/prAA:2025 has the following relationships with other standards: It is inter standard links to FprEN IEC 63341-2:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
FprEN IEC 63341-2:2025/prAA:2025 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2026
Železniške naprave - Vozna sredstva - Sistemi gorivnih celic za vozna sredstva - 2.
del: Sistem za shranjevanje vodika - Dopolnilo AA
Railway applications - Hydrogen and fuel cell systems for rolling stock - Part 2: Hydrogen
fuel system
Applications ferroviaires - Systèmes à hydrogène et à pile à combustible pour le matériel
roulant - Partie 2: Système à hydrogène
Ta slovenski standard je istoveten z: FprEN IEC 63341-2:2025/prAA:2025
ICS:
27.070 Gorilne celice Fuel cells
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST FprEN IEC 63341- en
2:2025/oprAA:2026
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD DRAFT
FprEN IEC 63341-2:2025
NORME EUROPÉENNE
EUROPÄISCHE NORM
prAA
November 2025
ICS -
English Version
Railway applications - Hydrogen and fuel cell systems for rolling
stock - Part 2: Hydrogen fuel system
Applications ferroviaires - Systèmes à hydrogène et à pile à To be completed
combustible pour le matériel roulant - Partie 2: Système à
hydrogène
This draft amendment prAA, if approved, will modify the European Standard FprEN IEC 63341-2:2025; it is submitted to CENELEC
members for enquiry.
Deadline for CENELEC: 2026-01-30.
It has been drawn up by CLC/TC 9X.
If this draft becomes an amendment, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.
This draft amendment was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 81192 Ref. No. FprEN IEC 63341-2:2025/prAA:2025 E
Contents Page
1 European foreword . 3
2 1 Modification to Clause 2, “Normative references” . 4
3 2 Modification to 8.8.3, “Structural design” . 4
4 3 Modification to 8.9, “Fire protection” . 4
5 4 Modification to 9.6.1, “On-board hydrogen receptacle” . 4
6 5 Modification to 11.3.1, “Maintenance requirements” . 4
7 6 Modification to 11.3.4.2, “Regular leakage inspection” . 4
8 7 Modifications to Annex D, “Standards, laws and regulations applicable in specific
9 countries or regions” . 4
10 8 Modifications to Annex E, “Recommendations for fire protection of the HFS” . 5
11 9 Modifications to Annex F, “Recommendations for minimum maintenance checks and
12 tasks” . 5
13 Annex ZA (normative) Normative references to international publications with their
14 corresponding European publications . 7
15 European foreword
16 This document (FprEN IEC 63341-2:2025/prAA:2025) has been prepared by CLC/TC 9X “Electrical and
17 electronic applications for railways”.
18 This document is currently submitted to the Enquiry.
19 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
20 1 Modification to Clause 2, “Normative references”
21 Add the following references:
22 EN 12663-1, Railway applications - Structural requirements of railway vehicle bodies - Part 1: Locomotives
23 and passenger rolling stock (and alternative method for freight wagons)
24 EN 15085-4, Railway applications - Welding of railway vehicles and components - Part 4: Production
25 requirements
26 EN 45545-2, Railway applications - Fire protection on railway vehicles - Part 2: Requirements for fire
27 behaviour of materials and components
28 EN 1779, Non-destructive testing - Leak testing - Criteria for method and technique selection
29 EN 1363-1:2020, Fire resistance tests - Part 1: General requirements
30 EN 1364-1, Fire resistance tests for non-loadbearing elements - Part 1: Walls
31 EN 1364-2, Fire resistance tests for non-loadbearing elements - Part 2: Ceilings
32 2 Modification to 8.8.3, “Structural design”
33 Replace the content of the subclause with the followi
...
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