It is the junction point and terminus of both the Hambuk and P'yŏngra lines of the Korean State Railway.

[1] 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.

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.

[1][4] Since the completion of the modernisation of the line from the DPRK-Russia border in 1993, this traffic is expected to increase once again.