# The Railways Infrastructure (Access and Management) Regulations 2005, Paragraph 1: Date of timetable change


(1) Subject to sub-paragraph (2) the working timetable must be established once per calendar year, and the change of working timetable must take place at midnight on the second Saturday in December.
(2) Where a change or adjustment to the working timetable is carried out after the winter, in particular to take account, where appropriate, of changes in regional passenger traffic timetables, it must take place at midnight on the second Saturday in June.
(3) Further changes to the working timetable may be made at such other intervals as are required.
(4) The infrastructure manager may agree different dates to those stipulated in sub-paragraphs (1) and (2) and, in this case, must inform the European Commission if international traffic may be affected.

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Source: https://www.legislation.gov.uk/uksi/2005/3049/schedule/4/paragraph/1 (the official version)
Page: https://openlegislation.uk/railways-infrastructure-access-and-management-regulations-2005/schedule-4/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.