Ultimately, the suburban line, which has in places the character of a mountain railway, the most difficult section and was therefore set back a little. In the incisions there, the fine sands turned into the Tegel proved to be floating sands, and even in the case of the Great Turkish Schanzen Tunnel the mountain pressure caused great difficulties in advancing in the insufficiently drained Sarmatian sands. Thus, the breakdown of the tunnel was delayed until the summer of 1895. For the suburb line was already on 1 August 1892 k.k. Chief engineer Albert Gatnar has been appointed as site manager, while for the waist line k.k. Chief Architect Anton Millemoth and for the Wientallinie and the Danube Canal Line k.k. Oberbaurat Professor Arthur Oelwein were responsible. Thus began the Stadtbahn construction work on 16 February 1893 with the waist line in Michelbeuern. Previously, however, was begun on November 7, 1892 by a groundbreaking ceremony with the removal of the water reservoir of the former Kaiser-Ferdinand water pipe in front of the Western Railway. Thus, this day can already be regarded as the start of construction.