We're traveling to Switzerland in Sept, with one side trip by train out of Switzerland to meet friends in Mittenwald, Germany for a two day stay. From there, we'll travel by train back to Switzerland to Chur. As far as I can tell, it looks like going thru Innsbruck will be the best option... (We'll be traveling around in Switzerland by train off and on after that for about a week). Which kind of rail passes should we get for the trip to Germany, since we may also go thru Austria??