Gunchū Line

Iyotetsu, the line's owner, is one of Japan's pioneering private railways. The company was founded on 14 September 1887, and its first route, the Takahama Line, opened on 28 October 1888 as the first railway on Shikoku and the third private railway in Japan; like the company's other early lines it was built to a narrow 762 mm gauge. The Gunchū Line, however, did not begin as an Iyotetsu line. It was opened on 4 July 1896 by the South Iyo Railway (南予鉄道, Nan'yo Tetsudō), which built the first stretch from Fujiwara — the station on the site of today's Matsuyama City Station — south to Gunchū at 762 mm gauge. (English-language sources date this first opening to 1895; the Japanese record gives 4 July 1896, which is followed here.)

The independent existence of the South Iyo Railway was brief. On 1 May 1900 Iyotetsu absorbed the company by merger, and the route became the Gunchū Line; the original Fujiwara terminus was consolidated into Sotogawa Station, the forerunner of the present Matsuyama City Station. The northern terminus then passed through a series of names: Sotogawa was renamed Matsuyama Station on 1 June 1902, and that station finally took the name Matsuyama City Station on 1 March 1927, by which time it had become the hub of Iyotetsu's network. Intermediate stations were added gradually over these decades, among them Jizōmachi (1901), Shinkawa (1909), Okada (1910) and Doida (1930).

The line's corporate ownership reflected the wider business of its parent. On 31 December 1916 Iyotetsu merged with Iyo Hydroelectric (伊予水力電気) and changed its name to Iyo Railway Electric (伊予鉄道電気), so that the Gunchū Line came under that combined railway-and-power company. This arrangement lasted until 1 April 1942, when the electric-power business was separated out and the railway operations reverted to a company once again called Iyotetsu, which has owned the line ever since.

Two changes in the late 1930s gave the line much of its modern form. On 22 July 1937 the entire route was regauged from the original 762 mm to the 1,067 mm narrow gauge used today, bringing it into line with the rest of Iyotetsu's network. Then, on 10 May 1939, the line was extended a short distance from Gunchū to a new terminus at Gunchū Port Station, the southern end it still reaches. The line was not electrified at its opening; electric operation between Matsuyama City and Gunchū Port did not begin until 10 May 1950, and the overhead voltage was later raised to 750 V on 25 March 1976.

In its present role the Gunchū Line carries dense local commuter traffic on the short corridor between Matsuyama and Iyo, paralleling the JR Yosan Line for part of its course. Newer rolling stock arrived when 3000 series trains entered service on the line on 12 December 2009. A timetable revision on 1 November 2023 set daytime services on weekends and holidays to run at twenty-minute intervals, reflecting the line's continuing function as a commuter artery for Matsuyama's southern suburbs.

• 18964 July: the South Iyo Railway opens the first segment, Fujiwara (today's Matsuyama City Station)–Gunchū, at 762 mm gauge.
• 19001 May: Iyotetsu absorbs the South Iyo Railway by merger; the route becomes the Gunchū Line, and Fujiwara is consolidated into Sotogawa (the future Matsuyama City Station).
• 190121 February: Jizōmachi Station opens.
• 19021 June: Sotogawa Station is renamed Matsuyama Station.
• 191631 December: Iyotetsu merges with Iyo Hydroelectric and is renamed Iyo Railway Electric; the line passes to that combined railway-and-power company.
• 19271 March: Matsuyama Station is renamed Matsuyama City Station.
• 193722 July: the entire line is regauged from 762 mm to 1,067 mm.
• 193910 May: the Gunchū–Gunchū Port section opens, extending the line to its present southern terminus.
• 19421 April: the electric-power business of Iyo Railway Electric is separated out, and the line reverts to a company once again called Iyotetsu.
• 195010 May: the Matsuyama City–Gunchū Port section is electrified.
• 197625 March: the overhead line voltage is raised to 750 V.
• 200912 December: 3000 series trains enter service on the Gunchū Line.
• 20231 November: a timetable revision sets daytime services on weekends and holidays to run at 20-minute intervals.