咸北線
In 1935, the port at Rajin was opened as an alternative to Unggi (now called Sŏnbong); at the same time, on 1 November 1935 the South Manchuria Railway opened the Ungra Line to connect Unggi to Rajin. An express train named "Asahi" from Xinjing, Manchukuo to Rajin was put into service in 1936 to connect to the ferry to Japan. After the end of the Korean War the Ungra Line was combined with several others to create the Hambuk Line as it is today.