My favorite accessible transit feature is the elevator at the Marienplatz station...it takes you from the platform right up into the plaza itself, just in front of the Glockenspeil.
I know there has been a dark history here regarding people with disabilities but walking around Munich today, you wouldn't know it. Wheelchairs abound and the people are very accepting and accomodating.
I wish I could find an American city that is this friendly for wheelchairs. You can see our report on Munich here.