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.
Kangwon Province (North Korea)
In 1945, Kangwŏn Province (along with the rest of Korea) was divided by the 38th parallel north in 1945 into Soviet and American zones of occupation in the north and south respectively. In 1946, the northern province was expanded to include the North Korean portion of Gyeonggi Province, and the area around Wŏnsan in South Hamgyŏng Province. The provincial capital of the North Korean portion of the province was established at Wŏnsan, as Kangwŏn's traditional capitals Wonju and Chuncheon both were south of the 38th parallel. In 1948, the province became part of the new Democratic People's Republic of Korea. As a result of the Korean War of 1953, the boundary between the North and South Korean portions of the province was shifted northward to the Military Demarcation Line.