I'll be traveling on a Eurail Global Pass this summer. I am aware I need certain seat reservations, incl for example, TGV trains in France. I already have bought one particular TGV resv. Does anyone know if it is permissible, in principle, ASSUMING SPACE IS AVAILABLE, I KNOW to exchange that for a TGV resv on the same route but a different train, AT NO EXTRA COST? I.e., simply swap one for the other? Just asking... Thx. Tom
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