Tipueyou45 In the past, there were two timetable periods in Europe (winter/spring and summer/fall) and all countries changed on the same day. Now, with dynamic online timetables and the proliferation of operators (state-owned or private), this becomes unpredictable. Some operators wait to know the final schedule, modified due to construction work for example, others publish a timetable and sell tickets months in advance, but then cancel trains and inform travelers by mail that they must find a new schedule.