The Hamgyŏng Line (Wonsan-Sangsambong) was a railway line in Korea, fully opened in 1928. It is now split between the following lines in North Korea:Kangwon Line(Wonsan-Kowon)
Hamgyong Line Wikipedia
The line was constructed by the Governor-General of Korea for the transport to Manchuria (northeastern China) and connected with the Gyeongwon Line at the Wonsan Station. The line was extended until 1928 as follows:
Since the 1930s international trains has been running through this line from Gyeongseong (Seoul) to Mudanjiang in China. The line also played the important role of invading Manchuria of Japan.