咸北線
The construction of the Korean-Russian Friendship Bridge across the Tumen River, along with the Hongŭi Line from Tumangang to Hongŭi on the Hambuk Line in 1959 created a direct rail connection between North Korea and the Soviet Union; this, along with the extension in 1965 of the P'yŏngra Line to Rajin, meeting up with the terminus of the Hambuk Line. This turned Rajin station into one of the most important stations on the entirety of the North Korean rail network, handling vast amounts of freight traffic to and from the Soviet Union and the former Communist countries of Eastern Europe.