Without having any definite information I think it is likely that there are still some remnants, but they are not obvious. Much of the course of the lines was probably along the side of the public roads and has probably been lost to road widening. Many of the smallest stations and halts were little more than small sheds that have been lost, reused for something or (possibly) incorporated in another building. Larger stations were likely to be in a style that was a variant of what I would describe as ‘French municipal’ and so are not particularly noticeable among other similar buildings.
As most stations had low or non-existant platforms and goods yards would, in most cases, consist of no more than a small shed they would simply disappear over time. There probably weren’t any major buildings, even in the main towns, and many lines never had the cash to replace their original wooden buildings, which have either disappeared or been repaired to unrecognisability. If you had a map you could probably follow the lines‘ course and from time to time see a building and think, “That must have been the station.” (This is not based on specific knowledge of the particular system. It is drawn from what seems to be a widespread pattern in France.)
If I might offer a few thoughts prompted by these matters: I gather that the CFD Reseau des Charentes et Deux Sevres was in fact -- as French metre-gauge railways went -- quite substantially and solidly constructed and equipped: as W.J.K Davies observes, "... very much a mainstream CFD system. Running mainly on its own right of way, it ... was generally efficient, if dull." (Mr. Davies: are you hard to please, or what?) In general, the French metre gauge would seem to have come in two "flavours": lines / systems designated as of
Interet General -- usually relatively well and solidly built and engineered; and those designated as of
Interet Local, which tended to be more lightly built and engineered, and more roadside-steam-tramway-ish (these
were tendencies: not "black / white" inevitably so, either way). "CFD Charentes / Deux Sevres", with its five -- or six, depending on how one reckons -- lines, was all
Interet General, except for the Matha -- Angouleme line, which was -- presumably owing to some quirky reason --
Interet Local.
I'd tend to figure, though; that pretty well anywhere in Western Europe, a narrow-gauge railway -- even if originally solid and well-built -- running through a basically low-lying landscape varying from flat to gently hilly (which description applies, I gather, to the parts of western France with which we are concerned here): will, if it was abandoned seventy-plus years ago, indeed have few easily recognisable traces remaining today. As per
@Gloster above -- probably a chance of, now and again, seeing a building; and reckoning, was probably -- or for sure -- the station.
There is a guy who posts quite frequently on the "Railway History and Nostalgia" sub-forum, with interesting items on long-closed, usually minor / light-railway / narrow-gauge, railways -- has done such items on one-time French metre-gauge lines, as well as many lines in the British Isles -- with both material from the days when these outfits were still running; and involving numerous photographs of recent date, supplemented with meticulous and ingenious "addenda" showing or strongly suggesting where the railway used to run -- with "phots" of such structures as recognisably survive today. I have the feeling that if this gentleman were let loose on the CFD Charentes etc.'s one-time routes, he would come up with impressive results !
An interesting and unusual feature of this part of France and its railways, is -- clue, the name "Reseau
des Charentes" (plural) -- rail-system-overspreading between the
departement of Charente; and that of Charente Maritime (previously called Charente Inferieure) immediately to its west. The CFD system had trackage in both; and also, as its name indicates, some in the far south of the
departement of Deux Sevres, immediately north of the "two Charentes" -- including the line which first attracted the OP's attention. There was also much additional metre gauge in both of the "two Charentes": belonging to the Chemins de Fer Economiques des Charentes. This undertaking (incidentally, very extensive -- it had some two and a half times the trackage length of that of the CFD system, against which it frequently abutted) was totally
Interet Local: very lightly constructed, and largely roadside. Essentially, hopeless once road motor transport was in the ascendant -- lines of this concern began closing in the early 1930s: diesel railcars were introduced, and may have helped a little -- some of the system was still open as at the onset of World War II, and got a reprieve because of wartime conditions -- the last line was abandoned in 1947. One would feel that trying to plot today, the course of one-time Economiques des Charentes routes; would be a decidedly challenging task.
http://www.passion-metrique.net/forums thread here on Charente : http://www.passion-metrique.net/forums/viewtopic.php?f=2&t=7763
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