I'm traveling with my fiance this summer (early August) for 10 days, five in Paris and five in Barcelona. We already have flights and hotels set up, and wanted to take the train from Paris (early afternoon) to Barcelona (arriving that evening). However, depending on the website I've seen prices range across hundreds of dollars, and I've seen plane tickets go for less than some of the train tickets.
Cost isn't a huge issue, but we don't want to spend hundreds (USD) per ticket. We will have about two bags per-person, one larger suitcase and one personal bag. This is the first time either of us have taken an international train in Europe so we're hitting the same wall in terms of understanding and decision making. Thank you!
Edit: My primary concern is that some train ticket websites have mentioned passes specifically for international train travel that would be a separate purchase. We do not currently have any such passes, and were only looking at train tickets. Are there additional documents required for this trip, other than our passports and the train tickets?