TGV -High Speed Train in Gare de Lyon from Paris - FRANCE The TGV (train à grande vitesse, French for "high-speed train" or "train of great speed") is France's high-speed rail service developed by GEC-Alsthom (now Alstom) and SNCF, the French national rail operator, and operated primarily by SNCF. It holds the record for the fastest wheeled train, having reached 574.8 km/h (357 mph) on 3 April 2007, and also holds the world's highest average speed for a regular passenger service. TGV is a registered trademark of SNCF. Operational speed are 300Km/h