At Schaarbeek the route splits in two; northward bound trains continue over line 25N, line 25, Antwerp and HSL 4 to the Dutch border, eastward bound trains continue over line 36N, line 2 and line 36 to Liège and from there over line 37 and HSL 3 and again line 37 to the German border.
At Schaarbeek, the route divides into two; trains traveling north continue on line 25N, line 25, Antwerp and HSL 4 to the Dutch border, while eastward bound trains proceed over line 36N, line 2, and line 36 to Liège and then onto line 37 and HSL 3, finally reaching the German border.