what trains to take & how to buy tickets between Cologne(2nts.) & many small towns like Bacharach,Heidelburg(lnt.),Rothenburg(1nt),Salzburg&Vienna (3nt.between the two)(we want to get on and off & maybe go to 2 or 3 a day if possible)? What about the 26 euro ticket Steve talks about in his book? Is thatjust good between two or three small towns?