There may be industrial action (aka strikes) on the french railways. These are the days provisionally indicated around RIPE 76.
Mercredi 9 mai 2018 Dimanche 13 mai 2018 Lundi 14 mai 2018 Vendredi 18 mai 2018 Samedi 19 mai 2018 Mercredi 23 mai 2018 For more information see: http://www.cestlagreve.fr/greve/sncf-avril-2018/#GbX2ozuhsSe4fZtQ.99 :-( Gordon
