2-6-0 "Mogul" steamlocomotive G 3/4 # 11 "Heidi" of the Rhaetian Railway, built in 1902 by SLM Winterthur, rebuilt to burn light oil and renovated by members of the association "Club 1889" from 2005 to 2015 (oil firing by DLM of Roger Waller), is crossing the highest viaduct of the RhB network, the 99 meter high and 210 meter long Wiesener viaduct, with a main span of 55 meter, with a train from Davos Platz to Filisur, Bergün and Samedan. This viaduct with a parabolic bow was built from 1906 to 1908, designed by Friedrich Hennings and conducted by Hans Studer. Richard Coray built the impressive wooden framework. The steamtrain with freight car L # 6603, passenger car BC # 110 "Il Mesolcines", passenger/bistro car C # 114 "La Bucunada" and open observation car B # 2100, ran for the patrons of the Bahnmuseum Albula Bergün "Gönnerclub 407".
