 Since then the line has been operated as the Frankfurt Harbour Railway ("Städtische Hafenbahn").Its importance for the newly developed harbour facilities, industrial estates on the Hanau state highway and Frankfurt's wholesale market, the Grossmarkthalle grew continuously in the period after the Second World War.When all the bridges over the Main were destroyed in 1945 after the end of the war, the line gained increased importance for transit traffic, because it was the only line for goods services from Frankfurt to the east.