"Stammnetzpendelzug" (push-pull train of the main network) with railcar Be 4/4 # 512, second class car B # 2411 and cab car ABDt # 1711, all built in 1971, is crossing the largest and highest stone built viaduct of the Rhaetian Railway, the Wiesener viaduct, running the regional train R 1813 from Davos Platz to Filisur.