Being on time over thousands of kilometers is a lot easier than being on time over dozens of kilometers. Especially if you share the same tracks with cargo trains, regional trains, and high speed trains and stop at every other village because that was the condition the nimbys required for allowing you to build the track in the first place.

Local trains in Moscow and Saint Petersburg ("elektrichka" with all local stops) may get delayed by a few minutes sometimes, true. But e.g. several trains being delayed by ten minutes because of an ice rain is newsworthy. At least that was the case on several directions I knew about.