Yes. The TGV runs on the French electricity grid, which is more than 90% decarbonised. A Paris-Marseille journey emits 2.4 kgCO2e by TGV compared with 150 kgCO2e by plane. The gap is even greater than with an electric car, because steel-on-steel contact and the number of passengers carried make the train much more efficient per traveller.
Read the source article: Train or plane: CO2 and actual times for 6 journeys from Paris