At least three times per week, you can now see such
a combination between Marseille and Paris:
TGV 824 (Duplex from Hyeres) and TGV 6524 (Réseau 
from Marseille).
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Here are trainsets 222 (Duplex) and 4504 (Reseau tri system
for operation into Italy) at Paris gare de Lyon, 06/06/2000.
 
Photo by Romain Viellard (ceferist@hotmail.com)