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.
Jangdan County
Jangdan County (read as "Jangdan-gun" in the Korean language) is a former county in Gyeonggi Province in Korea, which was divided into a northern part and a southern part when the USA and the Soviet Union jointly partitioned the Korean peninsula into two (the former controlled the southern half while the latter took over the northern half) during the division of Korea at the end of the Second World War towards the end of 1945. The northern part of Jangdan County has since been merged into Changpung County in North Korea while the former county's southern part now makes up Yeoncheon County and the city of Paju in South Korea (the northern and the southern parts of Jangdan County are still situated along the border between North Korea and South Korea, which used to be positioned on the 38th Parallel but is now located at the Korean Demilitarized Zone (the Korean DMZ).