The most remarkable thing about the route of the Mittenwald Railway is the long section with many tunnels along the edge of the Martinswand (Martin's wall), a rock face between Kranebitten and Hochzirl station, including the passage of the Martinswand Tunnel (1810.23 m) through the rock wall; it is the longest tunnel on the line. Slightly northwest of Hochzirl, the line runs over the southern flank of the Rauenkopf and southwestern flank of the Brunstkopf, crossing the Schlossbach on an elongated hairpin built with bridges and tunnels. Not far southwest of the bend, it passed the Zirl mountain.