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Rail timetable changes take place twice a year, usually in May and December. New timetables must be published 12 weeks in advance.
Network Rail is responsible for coordinating and validating timetables for the national rail network.
Each train and freight company develops the timetable they would like to run in their area, and Network Rail coordinates all the different timetables. They then produce a single national rail timetable.
Timetables are normally updated twice a year, in May and December. Timescales for producing the timetable are set out in the Network Code.