On the Tokyo subway system, a train arrives every minute all day, every day. It takes an earthquake, typhoon or giant lizard attacking the city to affect that - and not for that long, given the Tokyo subway was up and running a couple of hours after the earthquake a couple of years ago. Meanwhile, in London, a train arrived every 2-4 minutes, and that's only during weekdays and not on every line, and the service gets frequently delayed.
Another way to put it is the Shinkansen considers the train arriving at its destination two minutes behind schedule as "late" and that entitles all passengers to a full refund, whilst on our services the definition of "late" on any train, local or cross-country, it is eleven minutes and passengers accept it.