Kami-Kumamoto Line

The tram network that the line belongs to is municipally run. Its operator, the Kumamoto City Transportation Bureau, traces its establishment to 16 November 1921 and grew out of a predecessor known as the Kumamoto Electric Tramway; today it is a local public enterprise of the City of Kumamoto, operating the tram as a public undertaking. For much of its history the bureau also ran the city's municipal buses, but that bus operation was discontinued on 31 March 2015 and transferred to Kumamoto City Bus, leaving the tram as the bureau's core business.

The Kami-Kumamoto Line itself opened in two stages. The first section, from Karashimachō to Daniyamachō, was placed in service on 20 June 1929, opening the Senbabashi, Shioyamachi, Shinmachi, Shinzaikumachi, Urusanmachi, Shinokeyamachi and Daniyamachō stops along the way. The route was completed on 24 March 1935 when the section from Daniyamachō to Kami-Kumamoto-Ekimae opened, adding the Shimazakimachi, Sugidomo, Honmyōji-mae and Kami-Kumamoto-Ekimae stops. The stretch from Daniyamachō to Kami-Kumamoto was built along a road that was specifically cut and graded to carry the streetcar, and the area developed around the tramway; the Senbabashi–Shinmachi section is the line's only piece of reserved (dedicated) track.

The network's stops were repeatedly reorganised in the line's early decades. On 28 August 1936 the Kami-Kumamoto Line platform at Karashimachō was split off as a separate stop, Nishi-Karashimachi. In the wartime year 1943, on 28 December, the Senbabashi, Shinzaikumachi, Shinokeyamachi, Shimazakimachi and Sugidomo stops were all closed, although Sugidomo was later reopened. In May 1948 the Shioyamachi and Urusanmachi-Gokokujinja-mae stops (the latter afterwards renamed Urusanmachi) opened, the original first-generation stops of those names having already been removed by then.

A newer stop and several renamings followed in the postwar and modern eras. Kenritsu-Taiikukan-mae stop opened on 20 January 1983. On 1 March 2011 the Honmyōji-mae stop was renamed Honmyōji-iriguchi, and on 1 October 2019, the first day of the Reiwa era's first full year of operations, the Kami-Kumamoto-Ekimae terminus was renamed simply Kami-Kumamoto. Between January and March 2024 the stops on the Daniyamachō–Kami-Kumamoto section had their platforms lengthened and shelters installed, with work at Sugidomo limited to the shelter.

Today the Kami-Kumamoto Line is served as Route B of the Kumamoto City Tram, running through between Kengun-machi at the eastern end of the system and Kami-Kumamoto, at intervals of roughly seven to fifteen minutes. The Kumamoto City Transportation Bureau's car depot stands immediately beside the Kami-Kumamoto stop and doubles as the bureau's Kami-Kumamoto operations office, so the line carries depot in-and-out workings in addition to its regular through service.

• 192116 November: the Kumamoto City Transportation Bureau, the line's eventual municipal operator (predecessor: the Kumamoto Electric Tramway), is established.
• 192920 June: the first section, Karashimachō–Daniyamachō, opens, with the Senbabashi, Shioyamachi, Shinmachi, Shinzaikumachi, Urusanmachi, Shinokeyamachi and Daniyamachō stops.
• 193524 March: the Daniyamachō–Kami-Kumamoto-Ekimae section opens, completing the line; the Shimazakimachi, Sugidomo, Honmyōji-mae and Kami-Kumamoto-Ekimae stops open.
• 193628 August: the Kami-Kumamoto Line platform at Karashimachō is split off as a separate stop, Nishi-Karashimachi.
• 194328 December: the Senbabashi, Shinzaikumachi, Shinokeyamachi, Shimazakimachi and Sugidomo stops are closed (Sugidomo later reopened).
• 1948May: the Shioyamachi and Urusanmachi-Gokokujinja-mae stops (the latter later renamed Urusanmachi) open; the original first-generation stops of those names had already been removed.
• 198320 January: Kenritsu-Taiikukan-mae stop opens.
• 20111 March: the Honmyōji-mae stop is renamed Honmyōji-iriguchi.
• 201531 March: the Kumamoto City Transportation Bureau's municipal bus operation is discontinued and transferred to Kumamoto City Bus, leaving the tram as the bureau's core business.
• 20191 October: the Kami-Kumamoto-Ekimae terminus is renamed Kami-Kumamoto.
• 2024January–March: the stops on the Daniyamachō–Kami-Kumamoto section have their platforms lengthened and shelters installed (work at Sugidomo limited to the shelter).