Gyeongui Line (1904–1945)
Following Japan's defeat in the Pacific War and the subsequent partition of Korea, the Gyeongui Line was divided at the 38th parallel between North and South Korea. On 25 August 1945, the Soviet Army began operating trains on the line north of Sariwon, whilst trains in the south terminated at Gaeseong. In 1946, the railways in both North and South were nationalised, creating the Korean National Railroad in the South and the Korean State Railway in the North. After the Korean War, the Gyeongui Line was split into three sections. In the South, the Seoul–Jangdan section became the KNR's Gyeongui Line, retaining the same name; in the North, the Bongdong–Pyeongyang section became the P'yŏngbu Line, whilst the Pyeongyang–Sinuiju section became the P'yŏngŭi Line.
North Korea
Soviet forces withdrew from the North in 1948, and most American forces withdrew from the South in 1949. Ambassador Shtykov suspected Rhee was planning to invade the North and was sympathetic to Kim's goal of Korean unification under socialism. The two successfully lobbied Joseph Stalin to support a quick war against the South, which culminated in the outbreak of the Korean War.