On 8 July 1938, the Chosen P'yŏngan Railway opened the 34 kilometers Onch'ŏn Line from Chinnamp'o, terminus of Sentetsu's P'yŏngnam Line, to Ryonggang Onch'ŏn, running two daily passenger trains to connect the hot springs there with Pot'onggang Station in P'yŏngyang and with Tŏkch'ŏn on the West Chosen Central Railway's Seoseon Line.