I find your material posted here on the Forums about abandoned lines in south-west France, most interesting. Feel it to be striking how many station houses / buildings survive today, recognisable as such; and not in ruinous condition, but generally made over to one or another use.
I'm often not familiar -- certainly not nowadays -- with the whereabouts of many of the less-familiar towns referred to; but piecing said info together from available sources, is an interesting exercise. (Locating Gabarret proved a particularly hard nut to crack !) Passenger-withdrawal dates which you gave for the Marmande -- Bergerac line (part in December 1938, part in May 1940) prompt hypothesising to the effect that a good many of those lines which you deal with in your linked-to material, which are ex-SNCF; likely lost their passenger services in the drastic "purge" of such, which accompanied the SNCF's formation in 1938. By my understanding, a large majority of those 1938 closures were passenger-only, with a great deal of the trackage involved, keeping freight services -- often for (sometimes many) decades afterward: which would seem likely to have contributed to the survival today, of so much of the routes and things pertaining to them.
I being a narrow-gauge fan, a bit toward the point of obsession: mention of Bergerac in the link in this post, brings thoughts for me, of the one-time metre-gauge system of the Dordogne departement, from Bergerac northward to Perigueux, splitting there into two branches -- further northward, and north-eastward. This network, run by the big Chemins de Fer Departementaux (CFD) firm which operated independent railways, chiefly metre-gauge, in assorted parts of France; lasted in passenger and freight service until 1949, but was abandoned in toto in that year. It would seem fair to say that France's metre-gauge railways, having been mostly independent of the big railway companies whose merging formed the SNCF; were not affected especially by the 1938 closure programme -- but just faded away piecemeal and in plenty, and went on doing so, from the late 1920s on (some of them getting a few years' reprieve owing to World War II's straitened circumstances).