The run up to Christmas was very poor, but the big getaway period itself has largely been very successful - largely due to it being spread out more.
While this year's calendar has been relatively favourable for railway planners, it has been quite the opposite for
SNCF▸ . They have been getting flak for crowded trains and stations, and for "overbooking". Part of their excuse is that this year's school holidays start on the 23rd, which is as late is ever happens and it's been ages since the last one (actually 2006) so everyone has forgotten what to expect.
That is probably true, and the press comment is largely synthetic outrage. For a start all
TGVs▸ and some Intercités are reservation only, and while there may have been the odd glitch that led to people being unable to take their reserved seats that wasn't the big problem. It's the other Intercités where reservations are optional, and TERs that don't have reservations at all, that were so full it left barely enough elbow room for sending angry tweets.
I still haven't found out where SNCF tell you which Intercités require reservations, but I'm sure they must do somewhere. These are longer distance trains, of the traditional cross-country kind, and not very fast. I didn't realise until now that there are also long-distance TERs, which are even slower - so neither "express" nor "régional". For example, Paris Bercy-Lyon takes 3 hours to Dijon and 5 to Lyon.
SNCF didn't help their case when one of their staff tweeters used the word overbook and said they do it for the same reasons recently given here - people like the turn-up-and-go flexibility. Later they corrected that to point out these were trains with no bookings or admitting passengers without. Note that their unreserved tickets now valid for a week from the date you ask for - so the charge of "selling too many tickets" is less apt than it is here.
The complaint with most force was from people who did reserve but couldn't travel as the train was already full and in some cases left early for safety reasons. The SNCF answer was that they can't reasonably call the police to clear a train - but that is an admission that they don't attempt to regulate boarding on those trains (not so very many) nor enforce reservations.
Of course the journalistic comment didn't bother to understand any of that. And I do expect some here will be envious of that level of crowding.