Saving money on French trains (SNCF) is best achieved through advance booking and the use of discount cards. Tickets for high-speed TGV and Intercités trains typically go on sale 90 to 120 days in advance; buying "Prem's" fares early can save you up to 70% compared to last-minute prices. For travelers aged 12-27, 60+, or those traveling frequently, the Carte Avantage (€49) is a "must-have" as it guarantees a 30% discount on all TGV and Intercités trips and caps the maximum price for second-class tickets even during peak times. If you are on a tight budget, look for OUIGO trains, which are the low-cost version of the TGV; they depart from secondary stations and have baggage restrictions but offer fares as low as €10. For regional travel, check for "TER" discount cards specific to the region you are visiting (like the Zou! card in Provence). Additionally, if you plan to take many long-distance trips across the country, a Eurail or Interrail pass can be a better value, provided you account for the mandatory €10–€20 seat reservation fees required for every TGV journey you take.