Between 1 August and 3 November 1944, the second track of the 180 kilometers section between Sanshilibao (Sanjūrihō) and Dashiqiao (Daisekikyō) was removed, with the railways being used to upgrade Mantetsu's Anpō Line and the Manchukuo National Railway's Fengshan Line from Fengtian to Shanhaiguan. 『