Each region/state in germany offers rail passes that include local transportation. Can these passes be purchased at stations in germany or should they be purchased before arrival? Also, I asked earlier about Munich to Regensburg....Are bus/train on the Bayern ticket?
No need to prepurchase, they are not limited and take only a second to purchase from a machine in the station. They are for use on regional trains during the week (on weekends purchase the similar Schoenes Wochende passes instead). The Bayern ticket are good for unlimited on/off travel for the whole day - but don't start until the morning rush hour is over (9 or 9:30 am?). I can't recall whether I used them for S-Bahn, U-Bahn, or city busses. Lee is the train expert, especially for Germany, and can fill you in more fully. I find myself renting cars more lately, primarily so I can make lots of stops along the way at smaller towns and sights without losing the time I'd lose to making train connections.