It was once tried at Gare de Montparnasse, but wasn’t too successful. Most of the TGV traffic is at Paris, where all stations in the city are terminus stations

It was once tried at Gare de Montparnasse, but wasn’t too successful. Most of the TGV traffic is at Paris, where all stations in the city are terminus stations. So you’ll always have one power car at the platform and on the other side you are often constrained by signals.