Ah. Another one of those incomprehensible SNCF sales systems
The (Lyon-)Nevers-Nantes Intercités is NOT compulsory reservation
But the train I’m to take tomorrow is listed as “fully booked” but yet I can book a fully flexible ticket for a later one. Which if it’s fully flexible would allow me to take the earlier one!
(I’m on Interrail anyway so this is immaterial anyway, but the system makes no sense)
@jon You sure that would work? AFAIK some tickets are 'flexible' in that you can rebook onto other trains, but only if there would still be seats available on those trains (ie. you can't just hop onto whatever). Not sure if that's the case for SNCF.