Guidance

NTSN: infrastructure

National Technical Specifications Notices (NTSNs) relating to infrastructure (INF).

From:
Department for Transport
Published
2 May 2025

Applies to England, Scotland and Wales

Documents

PDF, 1.19 MB, 114 pages

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Details

This National Technical Specification Notice (NTSN) for infrastructure (INF) applies to rail projects that will seek authorisation to place new, upgraded or renewed railway infrastructure into service.

There are 2 documents on this page:

  • Issue 1 of the聽NTSN聽relating to聽INF, published 1 January 2021
  • Issue 2 of the聽NTSN聽relating to聽INF, published 2 May 2025

Issue 2 replaces Issue 1 and applies to projects聽that will seek an authorisation to place聽INF聽subsystems into service after 2 May 2025 (without prejudice to exemptions and transitional phases).

罢丑别蝉别听NTSNs聽have been published by the Secretary of State for Transport according to regulation 3B of the聽.听

In May 2025, the Secretary of State made updates to 7聽NTSNs, which were informed by a consultation exercise and industry recommendation facilitated by the Rail Safety and Standards Board.

They are applicable in Great Britain only.

Updates to this page

Published 2 May 2025

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