In 1942, an industry track was also opened, which connected Tango Yamada Station with the nickel refinery (Nippon Yakin Kogyo Co., Ltd's Oe Factory), located at Iwataki Town (the town to the northeast of Tango Yamada Station).
1942年（昭和17年）には丹後山田駅から北東の岩滝町にある精錬所（日本冶金大江工場）への専用線も開通した。