On SNCF (French National Railways), the primary difference between classes is space and service. First Class features a "2+1" seating configuration, meaning seats are wider with significantly more legroom and individual armrests. It is generally quieter, as it attracts fewer families and more business travelers. On TGV InOui lines, First Class passengers may also have access to electrical outlets at every seat and the ability to book "Espace Pro" quiet areas. Second Class uses a "2+2" layout; while still very comfortable by global standards, it is more crowded and livelier. Luggage allowance is identical for both classes, but First Class tickets often include more flexible exchange and refund policies. For a long journey (like Paris to Nice), the small price premium for First Class is often considered worth it for the added tranquility.