Will be joining a Rick Steves Barcelona-Madrid tour in 2020. Will be starting in Paris. Going to take the train to Carcassonne, stay one day, then on to Barcelona. Not sure how to book the Carcassonne-Barcelona ticket. Raileurope.com (the Rick Steves travel partner), says they can book the Carcassonne-Narbonne segment, but then I will have to book the Narbonne-Barcelona segment "locally". Not sure what that really means and haven't gotten a clarification. Has anyone traveled this route recently and can tell me how you went about it? I've used SNCF extensively, but never to Spain.
Thanks