Not sure where he gets 775km either but the actual length of the railroad between Paris and Marseilles is around 750km: https://en.wikipedia.org/wiki/LGV_M%C3%A

Not sure where he gets 775km either but the actual length of the railroad between Paris and Marseilles is around 750km: https://en.wikipedia.org/wiki/LGV_M%C3%A9diterran%C3%A9e https://en.wikipedia.org/wiki/LGV_M%C3%A9diterran%C3%A9e Obviously you can't always go completely straight when you're building on the ground.