How about Berlin's S-Bahn and U-Bahn? I was really impressed when I travelled there on holiday. Very clean, punctual, and frequent. The stations are pretty o

How about Berlin's S-Bahn and U-Bahn? I was really impressed when I travelled there on holiday. Very clean, punctual, and frequent. The stations are pretty old, but well maintained, and the train cars were reasonably new and clean.