The line initially runs alongside the BOB for just over before crossing the Lütschine river and starting its climb up the valley side. Initially it passes through forest, with a passing loop at Rotenegg at an altitude of . The forest is followed by alpine pastures which offer views of the Bernese Oberland including the town of Interlaken bracketed by Lake Thun and Lake Brienz. Another passing loop is located at Breitlauenen station, the line's only intermediate station at an altitude of .