FprEN IEC 63341-2:2025/FprAA:2026

Railway applications - Hydrogen and fuel cell systems for rolling stock - Part 2: Hydrogen fuel system

Publication date:   Jul 17, 2026

Scope

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