I think this is probably your man: https://gw.geneanet.org/vpelletant?n=blay&oc=&p=xavier+auguste
Gives a snapshot of his service with the SNCF.
His military service record is here: https://archives.ladrome.fr/ark:/24626/sxthnj8r15f2/64c575d1-eb86-4f6c-95ae-26bb07749c3a Image 747
It indicates that he held the Carte de Combattant, which would have entitled him to the Combatant's Cross.
Coincidently, he was born on the other side of Lyon from Chaponost, where my maternal grandmother was born. I've posted a number of times about her brother, Capitaine Marcel Verzieux.
Michael