When I was planning my cycle Camino at the end of last year (to travel April this year) there appeared to be trains from Paris Montparnasse to Bayonne on which unboxed bicycles could be taken. Unfortunately I was unable to travel due to illness so now planning for April 2024. However, a check on the SNCF website for the coming weeks (just out of curiosity) suggests that the only trains that will take bikes between PAris and BAyonne are overnight trains departing from Paris Austerlitz. Does anyone know if this is really the case or is it just more likely that all bike spaces out of Montparnasse have been booked up?