In 1933, the Susa - Utago section came into operation and by incorporating the Mine Line's Utago - Shomyoichi - Agawa section/Shomyoichi - Senzaki section as well as the Kogushi Line, the entire portion of the Sanin Main Line consisting of the Kyoto - Hatabu section and Shomyoichi - Senzaki section opened.
1933年に須佐～宇田郷間が開業し、美禰線の宇田郷～正明市～阿川間・正明市～仙崎間と小串線を編入して京都～幡生間・正明市～仙崎間となった山陰本線が全通した。