IEC 63341-2:2025 This part of IEC 63341 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).

NOTE This document can also be used for applications with hydrogen internal combustion engines.

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 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.

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.

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