Until 1989 when the line between Kizu and Nagao was electrified, the operation had been divided at Nagao Station and diesel trains ran between Kizu and Nagao (see the History also).
1989年に木津-長尾間が電化されるまでは長尾駅で運転系統が分かれ、木津-長尾間には気動車が運行されていた（歴史も参照）。