Another important aspect of the construction of the Stadtbahn was the demolition of the Linienwalls, a fortification around the Vienna suburbs. It had become militarily obsolete in the middle of the 19th century, which initially led from 1873 to the building of the 75- to 80-meter wide Gürtelstraße, with the inner belt within the wall and the outer belt running outside the wall. The demolition of the fortifications from 1894 then made room for new urban railway lines. An early alternative term for the Stadtbahn was therefore 'Belt train' or 'Short Belt railway'.