Kumagawa Railway

A Taisho-Era Line Across the Kuma Basin

The Kumagawa Railway (くま川鉄道, Kumagawa Tetsudō) is a 25-kilometre line that runs east across the Kuma Basin from Hitoyoshi Onsen Station in Hitoyoshi City to Yunomae Station in Yunomae Town, Kumamoto Prefecture; it opened in 1924 as the Japanese National Railways Yunomae Line, and its bridges and station structures were registered together as a Registered Tangible Cultural Property group on 19 December 2014. Eighteen of them appear in the Agency for Cultural Affairs database today: fourteen bridges and four station structures.

Before the rails arrived, the link between Hitoyoshi and Taragi was a scheduled horse-drawn coach. Work began at the Hitoyoshi end in April 1921, and the full line opened on 30 March 1924 with just five intermediate and terminal stations: Higo-Nishinomura, Ichibu, Menda (today's Asagiri), Taragi and Yunomae. Higashi-Hitoyoshi, now called Sagarahan-Ganjoji, was added in 1937. Planners once hoped to push the line over the mountains to meet the Tsuma Line in Miyazaki. That never happened.

Timber was the reason the line paid its way. At its peak, freight trains loaded with logs from the forests ringing the basin ran every day. Steam gave way to diesel in 1975, and freight ended in June 1980.

When the national railways were restructured, the Yunomae Line was listed in February 1987 among the rural lines slated for closure. Local debate centred on one question: how would teenagers get to the high schools strung along the route? The answer was a third-sector company, jointly funded by the Hitoyoshi-Kuma municipalities and private investors. Kumagawa Railway Co., Ltd. was founded on 26 April 1989 and took over the trains on 1 October that year. Students still make up roughly eight in ten passengers.

What Was Registered, and the Standard Designs Behind It

The 2014 registration covered 19 structures, numbered 43-0130 to 43-0148 in order along the track from the Hitoyoshi end. One of them, the Kumagawa Fourth Bridge over the main channel of the Kuma River, was carried away in the 2020 floods and no longer appears in the national database. The remaining eighteen are gathered on this page.

Most are civil-engineering works. The steel girder bridges range from the 3.4-metre Uchikado Bridge to the Mendagawa Bridge, six spans and 75 metres long. Two bridges are concrete girders, and two are small concrete arches that carry water under the embankment. The buildings are the timber terminus at Yunomae and three modest steel-framed waiting shelters put up between 1953 and 1963. Most of the bridges were finished in 1923 and 1924; some have been strengthened or repaired since, yet their original structure is still easy to read.

Look at several of these bridges in a row and what strikes you first is not individuality but standardisation. The railway authorities of the day issued standard designs by circular number, and lines across Japan were built to them. The plate girders here follow circular No. 540, the short I-beam spans No. 875, the arches No. 1007 and the skewed reinforced-concrete span No. 1305. Because the same girder type reappears at 20, 30 and 40 feet, travelling the line is a little like leafing through a catalogue of the standard designs, one page at a time.

The steel has its own story. The I-beams of the Uchikado Bridge were rolled by the Lanarkshire Steel Company in Scotland, those of the Takahashigawa Bridge by the Carnegie company in the United States, and those of the Gakeshita Bridge by Japan's government-run steelworks. Imported and domestic steel sat side by side on a single rural branch line in the 1920s.

Two registration criteria were applied. The long bridges and the station structures that shape the view along the line were registered as contributing to the historic landscape of the country; the small bridges and arches that preserve the details of the standard designs were registered as difficult to reproduce.

The 2020 Floods and the Return of Through Trains

The torrential rain of 4 July 2020 hit the Kumagawa Railway hard. The Kumagawa Fourth Bridge was swept away, all five of the company's railcars were flooded and the platform at Kawamura Station was washed out. Replacement buses ran over the whole route from 20 July. Trains returned between Higo-Nishinomura and Yunomae on 28 November 2021, but the stretch from Hitoyoshi Onsen to Higo-Nishinomura stayed on buses for years.

Through services resumed with the first train on 20 September 2026, six years and two months after the disaster.

Two stations changed names that day. Kawamura Station, which sat in a flood-prone spot, was rebuilt about 1 kilometre towards Hitoyoshi and renamed Sagara-Toshima, after the nearby Toshima Sugawara Shrine. The old Kawamura Station, where the registered waiting shelter stands, was due to be cleared away; residents asked for it to be kept, and in March 2026 Sagara Village turned it into a memorial to the disaster. Higashi-Taragi Station kept its location but became Taragi-Shorenji. The registered names still use the old station names.

How to See Them

The eighteen sites are spread over six municipalities. Just east of Hitoyoshi Onsen come the Omizo and Daiogawa bridges, with the Iwashimizu Arch Bridge near Sagarahan-Ganjoji Station. Past the old Kawamura Station in Sagara Village, Nishiki Town has the First and Second Kobashiragawa bridges, the Uchikado and Second Kakui bridges, and the shelter and platform at Kinoe Station. Asagiri Town holds the Gakeshita, Mendagawa and Iguchigawa bridges. Taragi Town has the Miyata Bridge, the Hirahara Arch Bridge, the shelter and platform at the former Higashi-Taragi (now Taragi-Shorenji) Station and the Hyakutaro Bridge. The Takahashigawa Bridge and the Yunomae station building close the sequence in Yunomae Town.

All of them are working railway structures, and walking on the track is prohibited. You will be looking at the bridges from nearby roads and irrigation channels, so keep out of fields and private land. The shelters and platforms are in daily use, so riding the train and stepping off is the way to see them up close. The Yunomae station building still serves as the terminus.

The smallest bridges are almost invisible from the train. A girder or arch of 3 to 5 metres is crossed in a blink, so if you want to study the structure, walk from the nearest station. The long spans work the other way round: the Mendagawa and Second Kobashiragawa bridges read best from a little distance, with a train crossing.

Fares and Getting There

Under the timetable introduced on 20 September 2026, twelve trains a day run in each direction between Hitoyoshi Onsen and Yunomae, taking about 45 minutes. The adult single fare for the full line is 700 yen. Stations with ticket machines sell a one-day pass (1,200 yen for adults, 600 yen for children), which pays for itself quickly if you plan to hop off at several bridges. Short-term foreign visitors can also buy a one-day pass for foreigners (1,000 yen adults, 500 yen children) at the Hitoyoshi Onsen Station counter. IC transit cards are not accepted.

Single-car trains are driver-only: board at the rear door, take a numbered ticket, and pay into the fare box when you get off. Longer trains carry a conductor who sells tickets on board.

Hitoyoshi Onsen Station adjoins JR Hitoyoshi Station, but the JR Hisatsu Line between Yatsushiro and Yoshimatsu has been suspended since the 2020 floods. Expressway buses take about 1 hour 30 minutes from central Kumamoto and about 50 minutes from Kagoshima Airport. By car, central Hitoyoshi is about 5 minutes from the Hitoyoshi interchange.