[2] From 1928, part of the line was electrified using surplus power from the copper mine.

[2] In 1951, the Hanaoka Line was converted to 1,067 mm (3 ft 6 in) 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.

[2] Passenger services on the Kosaka Line also ended on 30 September 1994.

[3] On 2 November 2014, the electronics manufacturer Panasonic ran a specially built battery-powered train over a distance of 8.5 km on the line to promote its "Evolta" range of batteries.

The lightweight car built of cardboard in conjunction with Akita Prefectural University was powered by 99 D size batteries, and carried 10 elementary school children at a speed of approximately 6 km/h.