A unique beautiful and perfectly organized large steam locomotive round tour from Zurich around the Säntis mountain of "Steam Adventure Tours". With triple traction of 2-6-2 T Eb 3/5 # 5819, 4-6-0 A 3/5 # 705 and 2-6-0 B 3/4 # 1367 (all of SBB Historic and based in Brugg AG), the 12 car train crosses the highest railway viaduct in Switzerland (99 meter height), the 365 meter long Sitter viaduct of the former Bodensee-Toggenburg-Bahn, today Südostbahn (SOB), between St.Gallen Haggen and Gübsensee. The main span of the girder is 120 meter.
