Agatsuma Line

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     Agatsuma Line
Omae Sta 20061108.jpg
115 series EMU at Ōmae Station, November 2006
Locale Gunma Prefecture
Termini Shibukawa
Stations 18
Opening 1945
Operator(s) JR East
Line length 55.6 km (34.5 mi)
Track gauge 1,067 mm (3 ft 6 in)
Electrification 1,500 V DC overhead catenary
Route map
JR Agatsuma Line linemap.svg

The Agatsuma Line (吾妻線 Agatsuma-sen?) is a local rail line in Gunma, Japan, and is part of the East Japan Railway Company (JR East) network. Roughly following the Agatsuma River, it runs 55.6 km between Shibukawa and Ōmae stations.

Although the official start of the line is at Shibukawa, all trains run through on the Jōetsu Line to/from Takasaki.


The Agatsuma Line was opened in 1945 and ran from Shibukawa to Naganohara-Kusatsuguchi. The line was extended to Ōmae in 1971. The newest station, Onogami-Onsen, was opened in 1992.

Yanba Dam construction[edit]

The Yanba Dam was expected to cause part of the line between Iwashima and Kawarayu-Onsen stations to become submerged. The dam project was ultimately cancelled, but the new section of railway line and roads under construction may be completed to serve the onsen hot spring resorts in the area and increase road and rail capacity. However, with the dam's future in question, what will happen with the line is unclear.

Points of interest[edit]

55.6 km post marking the end of the line at Ōmae Station

The Agatsuma Line is noted for numerous onsen hot springs along the route. The famous hot springs at Kusatsu are some distance north of the line, but several rural onsen such as those at Shima, Sawatari, Kawarayu, and Shiriyaki are more accessible.

Mount Asama, Mount Kusatsu-Shirane, and the Agatsuma Canyon can all be seen from the Agatsuma Line.

Japan's shortest railroad tunnel, the Tarusawa Tunnel, is on the Agatsuma Line.


Station Japanese Distance (km) Transfers Location
Shibukawa 渋川   0.0 Jōetsu Line (all trains through to Takasaki) Shibukawa Gunma
Kanashima 金島 5.5 5.5  
Ubashima 祖母島 2.2 7.7  
Onogami 小野上 4.2 11.9  
Onogami-Onsen 小野上温泉 1.8 13.7  
Ichishiro 市城 2.3 16.4   Nakanojō, Agatsuma District
Nakanojō 中之条 3.4 19.8  
Gunma-Haramachi 群馬原町 3.1 22.9   Higashiagatsuma, Agatsuma District
Gōbara 郷原 3.4 26.3  
Yagura 矢倉 1.7 28.0  
Iwashima 岩島 5.5 30.5  
Kawarayu-Onsen 川原湯温泉 5.9 36.4   Naganohara, Agatsuma District
Naganohara-Kusatsuguchi 長野原草津口 5.9 42.3  
Gunma-Ōtsu 群馬大津 2.2 44.5  
Haneo 羽根尾 2.2 46.7  
Fukurogura 袋倉 2.9 49.6   Tsumagoi, Agatsuma District
Manza-Kazawaguchi 万座・鹿沢口 2.9 52.5  
Ōmae 大前 3.1 55.6