I remember the days of commuting to school, every school day for 7 years between Church Stretton and Shrewsbury from 1969 to 1976. The afternoon train was late a handful of times each year, but it was quite rare, but the morning train was almost invariably on time. As kids we used to crave the train being late in order to have a valid reason to turn up late at school, but from memory I'd say it was more than 2 minutes late only once per year, and in 7 years I can only remember perhaps 2 or 3 occasions when it was more than 30 minutes late, out of around 1500 journeys!