How can I get from Barcelona, Spain to Carcasonne, France?
Go to www.bahn.de, the German rail site that has timetables for most of Europe. Click on "Internat. Guests" at the top of the home page to view the site in English. Do two searches, one for Barcelona Franca-Carcassonne and one for Barcelona Sants-Carcassonne. (Note the double "s" in "Carcassonne.") You'll see that you can either go Barcelona Sants-Cerbere-Carcassonne or Barcelona Franca-Narbonne-Carcassonne.