2-6-0 steamlocomotive G 3/4 # 11 "Heidi" of the Rhaetian Railway is leaving the 232 meter long Brombänz II tunnel and crossing the 43 meter long Brombänz viaduct over the Landwasser creek in the Zügen gorge between Davos Wiesen and Davos Monstein, to disappear immediately in the 113 meter long Brombänz I tunnel. Below the bridge is the old Zügen gorge road, now a hiking and biking path. Although the steam locomotive has to work hard at a gradient of 3.5 %, neither steam nor smoke can be seen at the chimney. Of course engineer Roger Waller, who is to be seen in the driver's cab and who developed the light oil firing of the locomotive, likes that. The locomotive "Heidi" can now run even in dry weather, independent of the danger of forest fires. The locomotive was built in 1902 by the SLM and was given the name "Heidi" after a short appearance in the film of the same name in 1952. From 2005 to 2015 the locomotive was extensively overhauled by the members of the "Club 1889", equipped with a new boiler and converted to an extra-light low-sulphur fuel oil firing system. The locomotive pulls a train of approx. 40 tons for the sponsors of the railway museum Albula in Bergün to Davos Platz.