the "chemins de fer d'intérêt local des landes" (cfill) opened several lines in 1890, between 1905 and 1911 the "chemins de fer du born et du marensin" (bm) opened more lines, some extending the cfill lines further from their terminii, others were new lines branching from the bordeaux - bayonne mainline. additionally the company "chemin der fer d'intérêt local de soustons à léon" (sl) had opened a 22 km line extending a branch extending the cfill in 1904.