Hambuk Line
Following the end of the Korean War, the Ch'ŏngjin–Sambong section of the Hamgyŏng Line, the Sambong–Unggi (renamed Sŏnbong) section of the North Chosen Line, and the Ungna Line from Sambŏng to Rajin were merged to create the Hambuk Line; this line, having been damaged during the war, was rebuilt with Soviet and Chinese assistance. The Korean-Russian Friendship Bridge across the Tumen River was commissioned on 9 August 1959, replacing the temporary wooden bridge, which had grown to be insufficient for the traffic crossing the river, and in 1965 the P'yŏngra Line was completed to Rajin, meeting up with the terminus of the Hambuk Line.