Steamlocomotive G 3/4 # 11 "Heidi" with a charter train from Davos Platz to Filisur-Bergün-Samedan is crossing the highest viaduct of the Rhaetian Railay, the 88.9 meter high Wiesen viaduct, with a parabolic bow of 55 meter main span, crossing the Landwasser river. The viaduct was built between 1906 and 1908 mainly with concrete blocks and faced with granite and gneiss stones.
