The diesel locomotives used to haul TGVs if necessary and to haul works trains on LGV lines are the 67200 class. This is why you can usually see a motley 67200 or two parked at Lille from passing Eurostars.
The 72000 class locos are not the TGV rescue locos.
What you see in the pictures is the small batch of Class 72000 locos that were modified with TGV couplings to haul electric TGVs over non-electrified lines on the west coast of France. For a period of time this was seen as the best way to extend the blue riband TGV service to west coast resort of Les Sables dOlonne.
They erected an isolated bit of overhead in Les Sables station but otherwise, between Nantes and Les Sables the line remained diesel worked (and retained old fashioned track and telegraph wires to boot).
The idea didnt last too long, and in 2004 they reverted to cross-platform connections at Nantes between TGVs and local passenger trains using old 1960s coaches hauled by 72000. This situation lasted until proper electrification in 2008.
