Well, at least part of the homework. (I should have noted already that they probably did consider capacity issues on the lines affected, because most of those are less busy and the lines from Paris are bypassed by a new Y line.)

• By curves allowing 220 km/h, do they mean curve radius or superelevation, too?
  
• What about track distance (in curves as well as on straight track)?
  
• Are sound barriers and re-signalling covered under "a few other amenities"?
  
• Have they done a ridership forecast with the lower top speed, especially on the Paris–Lyon and further relation? (I don't see how a connection significantly slower than the existing line can do much in helping relieve it even on the Paris–Lyon relation, much less further on.)

Also, was there a reaction to the dropping of the project to complete the Nantes–Lyon electrification (see Le Parisien map in afew's first comment), which would be part of the EELV plan, too, complemented by some new sections (orange line)?

_{*Lunatic*, n.
One whose delusions are out of fashion.}