| Railway | Line | Linetype |
| Tōbu | Kiryū | Non JR railway |
| Koizumi (1) | Non JR railway | |
| Koizumi (2) | Non JR railway |
| Opened | 1911 | Ōta - Yabuzuka (610 mm line) | Opened | 1932 | Aioi - Akagi |
| 1913 | Ōta - Aioi (1067 mm line) | Tracks | Single track |
| Mapion | Major stations | Connecting lines | Km | City | Prefecture | |
| Map | Map | Ōta | Tōbu: Koizumi (2), Tōbu: Isesaki | 0.0 | Ōta-shi | Gunma |
| Map | Map | Yabuzuka | | 9.7 | Ōta-shi | |
| Map | Map | Aioi | Watetsu: Watarase Keikoku | 16.9 | Kiryū-shi | |
| Map | Map | Akagi | Jōmō: Jōmō | 20.3 | Midori-shi |
| Type | Name | Origin - Major stops - Destination | Trains per day | Fastest train | Average speed |
|---|---|---|---|---|---|
| Limited Express Tokkyū 特急 | Ryōmō りょうもう | Asakusa (Tōkyō) - Isesaki line - Ōta - Akagi | 14 | 1h46 | 65 km/h |
| Local Futsū 普通 | Higashi-Koizumi - Koizumi line - Ōta - Akagi | 20 | 37 min | 43 km/h | |
| Ōta - Akagi | 5 | 27 min | 45 km/h |
| Opened | 1917 | Tatebayashi - Koizumimachi | Tracks | Single track |
| 1941 | Koizumimachi - Nishi-Koizumi |
| Mapion | Major stations | Connecting lines | Km | City | Prefecture | |
| Map | Map | Tatebayashi | Tōbu: Sano, Tōbu: Isesaki | 0.0 | Tatebayashi-shi | Gunma |
| Map | Map | Higashi-Koizumi | Tōbu: Koizumi (2) | 9.8 | Ōizumi-machi | |
| Map | Map | Koizumimachi | | 10.7 | Ōizumi-machi | |
| Map | Map | Nishi-Koizumi | | 12.0 | Ōizumi-machi |
| Type | Origin - Major stops - Destination | Trains per day | Fastest train | Average speed |
|---|---|---|---|---|
| Local Futsū 普通 | Tatebayashi - Nishi-Koizumi | 32 | 18 min | 40 km/h |
| Ōta - Higashi-Koizumi - Nishi-Koizumi | 1 | 16 min | 32 km/h |
| Opened | 1941 | Tracks | Single track |
| Mapion | Major stations | Connecting lines | Km | City | Prefecture | |
| Map | Map | Higashi-Koizumi | Tōbu: Koizumi (1) | 0.0 | Ōizumi-machi | Gunma |
| Map | Map | Ōta | Tōbu: Kiryū, Tōbu: Isesaki | 6.4 | Ōta-shi |
| Type | Origin - Major stops - Destination | Trains per day | Fastest train | Average speed |
|---|---|---|---|---|
| Local Futsū 普通 | Higashi-Koizumi - Ōta - Kiryū line - Akagi | 20 | 37 min | 43 km/h |
| Higashi-Koizumi - Ōta | 4 | 9 min | 43 km/h | |
| Nishi-Koizumi - Higashi-Koizumi - Ōta | 1 | 16 min | 32 km/h |
