 Kermarzin () and Le Cloître-Lannéanou () stations were followed by the summit of the line (over ) before Ploungonven-Plourin () was reached.At Morlaix the line was shared with the CF de l'Ouest's standard gauge dual gauge line between Paris and Brest.A dual gauge section of track was laid on the up line on the viaduct across the harbour.