Just a couple thoughts as we just returned from Spain
and made our reservations at the airport in Madrid. We tried to make
them from Canada before we left but were told we could only make
passes reservations and that you had to buy local train tickets in
Spain. None the less we did and we had reservations so there was no
hassels about seats etc.
Rick Steves has written a book about Rail and Bus travel in Spain and
Portugal that has some good info. He also has a website at