October 1, 1961: With the timetable revision, which was later called "San, Roku, To (3, 6, 10)," 'Tango' was upgraded to an express train with the 'Hakuto' diesel and began connecting with trains that arrived at and departed from and Osaka Station through the Fukuchiyama Line.
1961年（昭和36年）10月1日、サンロクトオとのちに称されるダイヤ改正に伴い、「白兎」気動車による急行列車に格上げし、福知山線経由大阪駅発着の編成を連結開始。