The undulating nature of the SNCF LGV lines is evident in this view of a pair of Paris Sud-Est TGV sets on a southbound service from Paris to Lyon near St.Ythaire north of Macon.
Here is a much more recent archive photo taken by the late O.S. Nock of the prototype TGV having a break during a test run. The date and location of this photo is unknown - over to you Jean-Marc! ... (more)