Less than a month after the end of the war, the Stadtbahn had to be imported due to a shortage of coal, which now had to be imported from the war-looted mining districts, on December 8, 1918 almost completely set again. Only the suburb line remained in operation almost throughout, even during and after the war, albeit at times greatly thinned. While in 1907 still 67 trains daily reversed, there were 1917/1918 only 50 trains and 1919 even only 22 trains. Only in 1920, the frequency increased again to 42 trains, 1921 then drove even 54 trains daily.