seat61.com will tell you which site to use for which route. reiseauskunft.bahn.de knows several languages, including of course English. There are also some pa

seat61.com will tell you which site to use for which route. reiseauskunft.bahn.de knows several languages, including of course English. There are also some pan-European booking sites, like loco2.com, happyrail.com and a few others. But these don't always manage to find the saver tickets, so you're sometimes stuck with full price.