The line from Matsuyama was extended in sections to Iyo Nagahama between 1927–35, with the former private line being regauged to 1067mm (3'6") gauge in 1935. Further western extensions opened 1936-45, when Uwajima (and the Yodo Line) was connected to the Yosan line. On August 1, 1933, the entire line was renamed the Yosan Main Line. In 1987, with the privatization of the Japanese National Railways, the line became simply the Yosan Line. The Takamatsu - Tadotsu section was duplicated 1965-70, and CTC signalling commissioned in 1985 between Takamatsu - Matsuyama. The 'direct line' between Mukaibara - Iyo Ozu (including the 6,012m Inuyose tunnel) opened in 1986, incorporating part of the former Uchicko branch and shortening the route by 6.3 km. The Takamatsu - Tadotsu section was electrified in 1987, enabling direct Takamatsu - Okayama services when the Seto Ohashi Bridge system opened the following year. The Iyo Hojo - Matsumoto - Iyoshi section was electrified in 1990, with the Tadotsu - Imabari section being energised in 1992, and the Imabari - Iyo Hojo section in 1993, enabling direct Matsuyama - Okayama electric services to be introduced. Following the Tohoku major earthquake, JR Shikoku, JR East, and JR Freight announced that JR Shikoku's popular Ampanman Torokko Train would tour areas devastated by the earthquake and tsunami. Former connecting lines Sakaide station - The Kotohira Express Railway Co. operated a 16 km line to Kotohira on the Dosan Line 1930-44, with the line formally closing in 1954. The Kotohira Sangu Railway Co. operated a 27 km line to Tadotsu 1922/28 - 63, with a 7 km branch to Kotohira operated 1923-63. Niihama Station - The Sumitomo Copper Co. operated a 15 km 762 mm gauge line to Hinokiogawa (known as the 'bottom line') opened in 1893 which included a 3 km duplicated section. It carried passengers 1929-55, and was electrified at 600 V DC in 1950. The mine closed in 1973 and the railway 4 years later. An isolated 5.5 km 762 mm line, situated at 80 0m elevation (known as the 'top line') and connected to the bottom line by a cableway operated 1893–1911. Station list Local trains stop at every station. For information on the Shiokaze, Ishizuchi, Uwakai and other limited express services, please see their respective articles. Legend Station: "●": all trains stop; "▲": some trains stop; "｜": all trains pass Track: "∥": double-track section; "◇": single-track section