SNCF has rescheduled thousands of services alongside the high-speed trains so people can catch a local TER then a TGV in the morning to reach Paris for business and a TGV and TER to return home at night.
The changes affect both correspondence and transversal routes to improve services.
The 320kph TGV puts Rennes at 1hr25 from Paris, 35min less that before, while Bordeaux travellers save 1hr10 with a trip now taking 2hr04.
Trains have greater passenger capacity and the Bordeaux trains can double-up at peak times, giving increased capacifrom 556 to 1,114 passengers.
The services will be the first to bear the new TGV inOui brand name.