1950年2月14日,也就是在毛泽东访问苏联期间,中苏两国签订了《中苏友好同盟互助条约》、《中苏关于中国长春铁路、旅顺口及大连的协定》等一系列文件。根据《中苏关于中国长春铁路、旅顺口及大连的协定》规定,“缔约国双方同意苏联政府将共同管理中国长春铁路的一切权利以及属于该路的全部财产无偿地移交给中华人民共和国政府。此项移交一俟对日和约缔结后立即实现,但不迟于1952年末”。 On February 14, 1950, that is, during Mao Zedong’s visit to the Soviet Union, China and the Soviet Union signed a series of documents such as the Treaty of Mutual Assistance and Mutual Assistance between China and the Soviet Union, the Sino-Soviet Agreement on China’s Changchun Railway, Port Arthur and Dalian. According to the “Agreement between China and the Soviet Union on the Changchun Railway, Lvshunkou and Dalian,” both parties agree that the Soviet government will jointly transfer all the rights of China’s Changchun Railway and the entire property belonging to the road to the government of the People’s Republic of China. The transfer was made immediately upon the conclusion of the peace treaty with Japan, but no later than the end of 1952. "