TGV INOUI started as an experiment on routes including Paris to Bordeaux, Paris to Lyon and Paris to Marseille. It has gradually replaced traditional TGV services from 2020 up to the end of 2022. Now, whenever you take the TGV, it will be a TGV INOUI.. You will mainly see the difference on the trains: some TGVs have two levels while others have one. More @Wikipedia
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