I see. I lived almost a decade in Berlin, and both in west and east. I cannot say enough good things about the trains. However I will not say they are always on time!
I lived in the Washington, DC area for ten years and used its train system every day, and it pales in comparison to Berlin. I've also tried New York City, San Francisco, Paris, Sydney, Moscow, and Atlanta, and Berlin was just top notch. I envy you immensely. The cleanliness, politeness of its passengers, above and under, it was just wonderful.
