Some countries with a good trains infrastructure makes bigger free of charge parkings in rural areas or just next to the cities and you can easily jump into a train/city trains-metros systems.
For example in Denmark they have busses connections when they wait basically in the middle of nowhere for another route bus so you can easily change it and don't worry. As we they are according to the trains timing. I lived 8 km away so sometimes had a chance just simple to walk.
If you get used to the trains it is quite hard to go back to busses.