> Maybe the capitals and major metro ones. My tier-2 EU city is has commuter trains every hour and every 30 minutes at rush hour.

I wonder if some more automation (GoA3/4) would help in being able to run things more often (at least during rush hour?):

* https://en.wikipedia.org/wiki/Automatic_train_operation

It's a rich first world country. Everything is already automated. The driver/conductor is justo monitoring.