Rail Interoperability Authorisation Guidance
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This guidance sets out the Department for Infrastructure’s approach to the authorisation of new, upgraded, or renewed railway subsystems in Northern Ireland under the Railways (Interoperability in Northern Ireland) Regulations 2026.
The guide explains regulatory requirements, roles and responsibilities and the end to end authorisation process. It provides practical guidance for applicants on safety assessment, conformity assessment, technical file preparation, and compliance with Technical Specifications for Interoperability (TSIs) and national rules, helping to support timely, high quality authorisation applications and safe integration into the rail system.