Brand new "Tango" ABe 4/6 # 4105/Be 4/6 # 4005 of the Appenzeller Bahnen (AB) is leaving Appenzell with the S 22 service # 2130 to Teufen, crossing the 296 meter long Sitter viaduct, which was built from 1902 to 1904 for the Appenzeller streetcar line. The AB gets 11 of this lowfloor vehicles, the first is in regular service since a few days.