Buying your ticket is another task. You can go to the ticket window where you have to get a number in most places like we used to at
the deli but it will be awhile. Maybe even an hour or two. Another option is buying your ticket at the self service machine. Which you can do with your eurail pass and we tried to show you how here. All in all the trains vary in niceness (the longest rides won't always be on the nicest trains), they are mostly on time, and they are the best financial choice for traveling Europe.
OH! And there is this ear thing no one has ever mentioned. When you are on a train, especially the high speed trains, and it goes through a tunnel your ears react like you're on a plane. Doesn't seem to happen in the subway, guess those are not going fast enough. But consider yourself forewarned.