Comment by snovv_crash

Swiss trains define on-time as within 3 minutes of schedule, and this includes all mechanical issues, suicides, etc.

And this includes multi-hour intercity train lines, double-decker trains, trains that stop inside of airports, local trains, everything. If you have just a couple lines in a single city, under a single jurisdiction, with no interdependencies and no freight on the same lines, then of course it gets a lot easier.