Afterward, mining of nickel was begun on Oe-yama mountain range, which was located to the southwest of Kaya Station, and so, in 1940, the railway to the mine, exclusively used for freight transportation, was opened.
その後、加悦駅の南西にある大江山でニッケルの採掘が開始されたため、1940年（昭和15年）に大江山鉱山への貨物専用鉄道が開業した。