A reduced timetable will be in place between 11am and 8pm. "By operating a reduced timetable during the hottest part of the day, we can provide a more reliable and comfortable service for customers." Off-peak services between London Marylebone and Birmingham Moor Street will be reduced to one train per hour, down from the usual half-hourly service. Read moreSome services between London Marylebone and Oxford will be cancelled, and there will be no Chiltern Railways services running from Birmingham Snow Hill from 10.15am until the end of the day. Other operators are running reduced timetables or warning of possible short-notice cancellations.