used the auto train a few times down to south of france without issue, not been to Bordeaux on it though. We went from Paris to avignon a couple of times and Paris to Niece. A few words of advice if going this way, your bike goes on a separate train to yourselves, you put the bike on the train at Paris Bercy station and you get the passenger train from Gar de lyon station about 1Km away, just a short stroll. when booking your tickets for the TGV passenger train, they release the tickets 3 month in advance get them as soon as released, the same day if possible it will save you a fortune, prices for tickets for 2 this year one way cost 42 Euro a day later they were 65 euro, and a week later were 112 euro, and after that were 165 euro. If anyone needs more info pm me, and i will try to help.