Shimabara Railway Line (島原鉄道線): History & Facts

History

A provisional railway licence was granted in 1907 and the company was established in 1908. The full licence followed in 1909 and construction began; on 20 June 1911 Shimabara Railway opened the first section, as far as Aino-mura (today's Aino Station), and the whole Isahaya–Aino-mura stretch was open before the end of that year. The railway then pushed east and south along the peninsula in stages — reaching Kōjiromachi (now Kōjiro) in 1912 and Ōmisaki and Minato-Shinchi (today's Shimabara-Funatsu) in 1913 — building the northern portion that was long known as the Kitame Line.

The continuation south of Shimabara was built by an affiliated company, the Kuchinotsu Railway (originally chartered as the Shiranui Railway), which opened the Shimabara-Minato–Dōzaki section on 22 April 1922 and extended it to Minami-Arima (later Harajō) in 1926 and onward to Kazusa on 1 March 1928, completing the through route. This southern portion was known as the Minanme Line. Both companies introduced internal-combustion traction between the wars — the Kuchinotsu Railway from 1930 and Shimabara Railway from 1934 — and on 1 July 1943 Shimabara Railway absorbed the Kuchinotsu Railway, uniting the whole Isahaya–Kazusa route under one operator.

From 11 April 1958 the line ran through trains beyond Isahaya onto Japanese National Railways' Nagasaki Main Line as far as Nagasaki, and from 1960 through to Hakata coupled to JNR semi-express trains (later expresses), giving the peninsula a direct rail link to the wider Kyūshū network. These through workings onto JNR lasted until 1 October 1980, after which the line's role narrowed to local service within the peninsula and its connection at Isahaya.

The eruption of Mount Unzen (Fugen-dake) reshaped the line in the early 1990s. On 3 June 1991 it cut the section between Minami-Shimabara and Futsu, and services were disrupted for about half a year; in 1992 the Shimabara-Gaikō–Fukae section was cut as well. After a mudflow on 28 April 1993, that section was suspended from 29 April, and a fundamental countermeasure was adopted: the line between Shimabara-Gaikō and Fukae was rebuilt on an elevated viaduct, with work carried out from 1995 as part of public disaster-recovery works tied to the Mizunashi River diversion levee. The elevated section was completed and the full line reopened on 1 April 1997.

The long disruption proved decisive for the line's southern half. Shimabara Railway had run in the black since the 1985 financial year and was a rare profitable rural line, but the lengthy closures and the loss of passengers pushed it into deficit; the Minami-Shimabara–Kazusa stretch accounted for roughly 80 percent of the losses, and the property tax on the rebuilt disaster-recovery bridges added to the burden. In January 2007 the company announced it would abandon the section from Shimabara-Gaikō to Kazusa, and on 1 April 2008 that roughly 35-kilometre southern portion — running from kilopost 43.2 to 78.5 — was closed, shrinking the line to its present length. The closure also retired the line's vintage KiHa 20 series diesel railcars, which in their old red-and-beige JNR livery had made the line a favourite of railway enthusiasts.

The line is now worked by KiHa 2500-series diesel railcars, and at the Isahaya end it also carries commuter traffic. One-man operation began in 1999 and was extended to two-car trains in 2019, and on 1 October 2019 many stations were renamed — including the southern terminus, which changed from Shimabara-Gaikō to Shimabara-kō. The company, which also runs buses and ferries, operates a sightseeing train along the Ariake Sea coast, the "Shimatetsu Café Train", mainly at weekends.

Stations on this line

24 stations tracked on the map, listed alphabetically. Select any to read its page.

Timeline

1908The Shimabara Railway company is established (provisional licence granted 1907, full licence 1909).
191120 June: Shimabara Railway opens its first section, as far as Aino-mura (now Aino); the whole Isahaya–Aino-mura stretch is open before the end of the year.
1913The northern (Kitame) line is completed to Minato-Shinchi (today's Shimabara-Funatsu), having reached Kōjiromachi in 1912.
192222 April: the affiliated Kuchinotsu Railway opens the Shimabara-Minato–Dōzaki section, beginning the southern (Minanme) line.
19262 July: the Kuchinotsu Railway extends the southern line from Dōzaki to Minami-Arima (later Harajō).
19281 March: the Kuchinotsu Railway opens Minami-Arima–Kazusa, completing the through route to Kazusa.
19431 July: Shimabara Railway absorbs the Kuchinotsu Railway, uniting the whole Isahaya–Kazusa line under one operator. (Internal-combustion traction had been introduced — Kuchinotsu 1930, Shimabara 1934.)
195811 April: through services begin onto JNR's Nagasaki Main Line to Nagasaki; from 1960 trains run through to Hakata coupled to JNR semi-express trains (later expresses).
19801 October: through running onto JNR lines ends; the line reverts to local service within the peninsula.
19913 June: the eruption of Mount Unzen cuts the Minami-Shimabara–Futsu section; the line is fully restored about six months later, on 27 December.
199329 April: the Shimabara-Gaikō–Fukae section is suspended after a mudflow the previous day; it would not reopen for several years.
19971 April: the rebuilt elevated viaduct between Shimabara-Gaikō and Fukae is completed and the full line reopens.
20081 April: the roughly 35 km southern section from Shimabara-Gaikō to Kazusa (kilopost 43.2–78.5) is abandoned for low ridership; the vintage KiHa 20 series railcars are retired.
20191 October: many stations are renamed, including the southern terminus, which changes from Shimabara-Gaikō to Shimabara-kō (Shimabara Port). Two-car one-man operation had begun on 20 September.

Sources

Last updated 16 October 2026.