started looking through first page, then realized there were 66 pages. Found a couple of interesting manuals, including one on the Saint Chamond. Needs more time to check through them all.
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Mainly interested in narrow gauge railways, currently working a number of WW1 projects in 1/35 scale , website http://www.rue-d-etropal.com/
not found anything else yet that might be relevant but Im not specifically looking for light railways.... its probably best to limit searches to specific key words as the search engine picks up on everything, the most relevant results arnt necessarily at the beginning.. eg Locotrateur will bring up 12 pages of books.
Chances are theres a lot of hidden info on french WW1 light railways on Gallica but it can be difficult to prise free...