 The line, which was standard gauge, ran for some across the High Fens (Hautes Fagnes, Hohes Venn) to the south of Aachen in a roughly southward direction from Eupen via Raeren (the site of the depot), Monschau (Montjoie) and Malmedy to Trois-Ponts, with a eastward branch from Oberweywertz to Bütgenbach and Losheim.At Eupen it connected with the line to Herbesthal where it joined the Brussels-Cologne main line.At Trois-Ponts it connected with the Liège-Luxembourg line.