@pieist but all this to say, rather than building a high speed line through central france, i'd rather they focus on bringing the Paris - Clermont line up to 200km/h, and instead spend the money on fixing up the regional and interregional network in central France (reopening closed lines, improving performance etc...)
@pieist I'm from the Massif Central, so the cost of my time and Sanity :(
But actually, the rail line between Paris and Clermont-Ferrand is wholly adequate, although some segments need to be brought up to 200km/h.
However south of Clermont-Ferrand, everything goes (literally) south: no electrification, tracks in a mediocre state, drastic speed limitations...