 From 1928, part of the line was electrified using surplus power from the copper mine.In 1951, the Hanaoka Line was converted to gauge, and the Kosaka Line was also regauged to 1,067 mm from 1 October 1962, from which time diesel haulage commenced and passenger and freight services were operated separately.The Hanaoka Line closed as of 1 April 1985.