In 1948, the electrification of the section from Kaegu to Koin was completed, but this was subsequently destroyed during the Korean War. The re-electrification of the line began in 1975 with the completion of the section from Hŭich'ŏn to Koin, followed by the Kaech'ŏn - Hŭich'ŏn section in 1979; the remaining sections, from Koin to Manp'o and from Kaech'ŏn to Sunch'ŏn, were completed in 1980.