april 9 , 1958: double tracking was restored to the section between takaragaike and iwakura . 1958年(昭和33年)4月9日 宝ヶ池~岩倉間が再複線化。
september 28 , 1990: double tracking was restored to the section between iwakura and nikenchaya . 1990年(平成2年)9月28日 岩倉~二軒茶屋間が再複線化。
july 1 , 1951: double tracking was restored in the section between yamahata station and yase station . 1951年(昭和26年)7月1日 山端~八瀬間が再複線化。
(for details , refer to double tracking of the northern section of sasayamaguchi station on the fukuchiyama line , and the current situation ) (詳しくは福知山線篠山口駅以北の複線化と現状を参照)