As a result of the collapse of the Habsburg monarchy, the dissolution of Austria-Hungary, which took place in the autumn of 1918 and 1919/1920 was confirmed in peace treaties, the state railway lost much interest in the Vienna Stadtbahn; even the earlier military considerations no longer mattered. In addition, the Federal Constitution, passed on 10 November 1920, and the divorce law of 29 December 1921 based on it, led to the detachment of the municipality of Vienna from the province of Lower Austria, so that two federal states had to coordinate with each other in Stadtbahn traffic into the surrounding area.