Other new construction took place prior to 1950, but the Korean War which broke out on 25 June 1950 interrupted progress. Initially, the Korean People's Army was dominant, occupying most of the Korean Peninsula apart from a small pocket around Pusan; during this time, many railway vehicles, such as DeRoI-class electric locomotives and steam locomotives built in Japan after the end of the war and delivered to South Korea as reparations, were taken to North Korea. At the same time, war aid in the form of locomotives and freight cars arrived from friendly socialist countries such as the USSR, China, Poland, Hungary, and Czechoslovakia. American-led United Nations forces quickly turned the tide of the war, however; by 19 October of the same year had captured P'yŏngyang, and a week later, South Korean troops reached the Yalu River. Throughout the Korean War, much of the railway infrastructure and many of the locomotives were destroyed. On 31 December 1950, a train, consisting of the locomotive Matei 10 and 25 cars, going from Hanp'o to Munsan was ordered to stop at Changdan by the US Army, and was destroyed; the track was also destroyed, after which the Kyŏngŭi Line remained severed for over 50 years. UN forces were quickly pushed back south of the 38th parallel, and by the end of the year the war had become a stalemate; little exchange of territory happened over the next two years of fighting until the Korean Armistice Agreement was signed on 27 July 1953.