There's also the Eurail and Germanrail (for non-eu residents) and Interrail (for eu residents) passes that give you several days of travel within a month. I pai

There's also the Eurail and Germanrail (for non-eu residents) and Interrail (for eu residents) passes that give you several days of travel within a month. I paid 230 Eur for 5 full days of travel within a month, and there's twin tickets that are a bit cheaper per person. Also there's the summer special, where you can get 4 trips for 96 euros.