Information can be obtained here . A few notes on long distance train travel. Aside from the ultra-modern TGV, the SNCF uses primarily two models of train cars. The older ones are divided into compartments of six moderately uncomfortable seats, while the newer ones are merely organized into rows of comfortably reclining seats. Trains are always divided into Second Class and First Class, Smoking and Non-Smoking.
Most trains offer snacks and drinks and many are equipped with dining cars.
Having your dinner on a train, elegantly seated at a table with linen tablecloth and real silverware can be a lot of fun, but be prepared to spend close to 150 FF per person for the meal. Otherwise, bring along your own provisions, especially a bottle of water. The least expensive sleeping arrangement on a night train is the couchette or six-bunk compartment. Depending who you get in your compartment, you may be able to sleep well or not at all. We can offer no advice for these Mediterranean journeys, unless you wish to take a gas mask with you.