Itoda Line

Short as it is, the line grew out of two separate origins — the Tagawa-Gotōji–Itoda section in the south and the Kanada–Itoda section in the north — both built to haul coal out of the Chikuhō coalfield. The southern part came first, opened in 1897 as a branch of the original Hōshū Railway, together with a freight line from Miyatoko Station (now Itoda Station) to Toyokuni Station. That railway was absorbed by the Kyushu Railway in 1901, and the Kyushu Railway was in turn bought by the state in 1907 under the Railway Nationalization Act. When the government railways issued their line-naming scheme in 1909, the Gotōji–Miyatoko stretch and the Miyatoko–Toyokuni freight branch were designated the Miyatoko Line (宮床線).

The northern section was built later by the Kingū Railway, which opened the Itoda–Kanada stretch and Itoda Station on 1 February 1929. Within months the line was transferred to the Kyushu Sangyō Railway, which renamed itself the Sangyō Cement Railway in 1933; the Buzen-Ōkuma halt opened along the route in 1942. The two threads were finally joined during the Second World War: on 1 July 1943 the Sangyō Cement Railway was purchased under wartime nationalisation and merged into the Miyatoko Line, and the combined Kanada–Itoda–Gotōji route — together with the Itoda–Toyokuni freight branch — was renamed the Itoda Line. In the same reorganisation the old Sangyō Cement Itoda Station was abolished and folded into Miyatoko Station, which was itself renamed Itoda Station, and the Buzen-Ōkuma halt was upgraded to a full station.

The early post-war decades saw the line slowly shed its freight-era apparatus. The Itoda–Toyokuni freight branch was closed in 1945 and absorbed into Itoda Station, the freight station at Ōyabu was abolished in 1954, and steam locomotive operation ended in December 1974. In 1982 the southern terminus, Gotōji Station, was renamed Tagawa-Gotōji Station, the name it still carries.

As the Chikuhō coalfield declined, both passenger and freight traffic fell away, and under the JNR reconstruction law the Itoda Line was designated a third-round Specified Local Line. Approval to abolish it as such came on 3 February 1987; all freight operations ceased on 1 April 1987, the same day the line passed from JNR to the newly formed JR Kyushu at privatisation. Rather than close outright, the line was handed to a new third-sector operator: on 1 October 1989 JR Kyushu transferred the Itoda Line, along with the Ita Line and the Tagawa Line, to the Heisei Chikuhō Railway. Because coal traffic had kept it busy, the line had never been mothballed as a wartime "non-urgent" route in the way some lines such as Hokkaidō's Sasshō Line were.

Under Heisei Chikuhō Railway the line gained new infrastructure and stations it had lacked as a freight corridor. Ōyabu Station, distinct from the old freight stop of the same name, opened on 1 October 1990; tablet-block working was replaced by a special automatic block system in March 1994; and Matsuyama Station opened on 22 March 1997. In October 2019 station numbering was introduced across the Ita, Itoda and Tagawa lines, giving the Itoda Line stations the HC-series codes they bear today.

Now a quiet local railway, the Itoda Line runs roughly one to two trains an hour, almost all of them single-car, one-man (driver-only) services. Many trains simply shuttle between Kanada and Tagawa-Gotōji, while others run through onto the Ita Line toward Nōgata. At its northern end the line meets the Ita Line at Kanada, and at its southern end it connects with JR Kyushu's Hitahikosan Line and Gotōji Line at Tagawa-Gotōji.

• 189720 October: the original Hōshū Railway opens the Gotōji–Miyatoko–Toyokuni line (Miyatoko–Toyokuni as freight) to carry Chikuhō coal; the freight stations Ōyabu and Toyokuni and Miyatoko Station open.
• 19013 September: the Hōshū Railway is merged into the Kyushu Railway.
• 19071 July: the Kyushu Railway is purchased by the state under the Railway Nationalization Act, becoming a government railway.
• 190912 October: under the government railways' line-naming scheme, the Gotōji–Miyatoko section and the Miyatoko–Toyokuni freight branch are designated the Miyatoko Line.
• 19291 February: the Kingū Railway opens the Itoda–Kanada section, and Itoda Station opens.
• 19291 June: the Kingū Railway is transferred to the Kyushu Sangyō Railway.
• 19336 October: the Kyushu Sangyō Railway is renamed the Sangyō Cement Railway.
• 19421 October: the Buzen-Ōkuma halt opens.
• 19431 July: the Sangyō Cement Railway is purchased under wartime nationalisation and merged into the Miyatoko Line; the combined Kanada–Itoda–Gotōji route plus the Itoda–Toyokuni freight branch is renamed the Itoda Line. The old Sangyō Cement Itoda Station is abolished and merged into Miyatoko Station, which is renamed Itoda Station; the Buzen-Ōkuma halt becomes a full station.
• 194510 June: the Itoda–Toyokuni freight branch is abolished and absorbed into Itoda Station; the freight station Toyokuni is closed.
• 19541 April: the freight station Ōyabu is closed.
• 1974December: steam locomotive operation ends on the line.
• 19823 November: Gotōji Station is renamed Tagawa-Gotōji Station.
• 19873 February: abolition is approved under the third round of Specified Local Lines. 1 April: all freight operations cease and the line passes from JNR to JR Kyushu at privatisation.
• 19891 October: the line is transferred from JR Kyushu to the Heisei Chikuhō Railway, together with the Ita Line and the Tagawa Line.
• 19901 October: Ōyabu Station (a new passenger station, distinct from the former freight stop) opens.
• 1994March: tablet-block working is abolished and replaced by a special automatic block system.
• 199722 March: Matsuyama Station opens.
• 20191 October: station numbering is introduced across the Ita, Itoda and Tagawa lines.