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
The relative peace between the South and the North following the armistice was interrupted by border skirmishes, celebrity abductions, and assassination attempts. The North failed in several assassination attempts on South Korean leaders, such as in 1968, 1974 and the Rangoon bombing in 1983; tunnels were found under the DMZ and tensions flared over the axe murder incident at Panmunjom in 1976. For almost two decades after the war, the two states did not seek to negotiate with one another. In 1971, secret, high-level contacts began to be conducted culminating in the 1972 July 4th North-South Joint Statement that established principles of working toward peaceful reunification. The talks ultimately failed because in 1973, South Korea declared its preference that the two Koreas should seek separate memberships in international organizations.