On 9 August 1945, the Soviet Union invaded Manchukuo, and on the 14th, the USSR and the Republic of China signed a treaty of friendship; the signing of the treaty was announced on the 27th. Under the terms of this treaty, a Sino-Soviet joint enterprise was formed, called the China Changchun Railway, to operate the Renkyō Line (known as the Changda Line after Xinjing reverted to its original name, Changchun) and a number of lines formerly owned by the Manchukuo National Railway, including the Xinjing–Harbin Jingbin Line and the Harbin–Manzhouli Binzhou Line. Mantetsu was formally dissolved on 30 September 1945. The China Changchun Railway was transferred to China Railway in 1955, after which the Changda Line was split up, with the Dalian–Shenyang section becoming the Shenda Railway, and the Shenyang–Changchun section becoming part of the Beijing–Harbin Jingha Railway.