Getting this back on topic:
Well, I can throw in my $.02 about the train/subway system in Germany after having ridden it in Munich and Frankfurt, as well as taking the ICE (InterCity Express) between Munich and Frankfurt.
The S-Train (Surface) and U-Train (Underground) system works pretty well. The whole system seems to work on the honor system for riding it. There aren't any turnstiles or anything like I've seen in Taipei, Las Vegas, etc keeping only paying customers on the train. The trains were clean though not necessarily new, very on time, and not air conditioned. The ticket machines are very confusing to someone who doesn't read German though.