Well I'm talking about high speed train lines, I only included Quimper-Vintimille for comparison. Even if you somehow counted only >300km/h as high-speed, then

Well I'm talking about high speed train lines, I only included Quimper-Vintimille for comparison. Even if you somehow counted only >300km/h as high-speed, then the LGV Est is a bit more than 300 km long and rated at 320 km/h. I suspect a 100 km-long high-speed line would not even be competitive against cars, except maybe in dense urban areas where car traffic is often slow.