It is remarkable: I can only imagine that it's heavily over engineered to make sure everything is reliable. When visiting Beautiful WIfe's family in
Ise I'm always astonished at the frequency of trains; there are two entirely separate railways serving the town and one has a train every few minutes.
I also remember in (i think) Nagano on the national rail network, we had a reservation for a train in carriage #4. We got on the platform to find half of a multiple unit: one carriage with a cab, one trailer with a corridor connection but no cab; something you'd never see in Europe, if you did it would mean the train was terminally broken down and would be cancelled, but no: five minutes before departure time a complet four car unit arrived, coupled up. Made a noise like a sneeze and fired its corridor connection over to the half unit, we got on carriage 4 and away we went, bang on time...
The only problem I have is the lack of through ticketing, which we now take for granted. If they would adopt that it'd be perfect.