The Kusatsu-sen is a railway line in western Japan operated by West Japan Railway Company (JR West). It connects Tsuge Station on the Kansai Main Line with Kusatsu on the Biwako Line (Tōkaidō Main Line).
CTC signalling was commissioned in 1979, the line was electrified in 1980 and freight services ceased in 1987.
Construction of a new station, "Minami-Biwako", began in May 2006 and was planned to be completed in 2012. The station was proposed to allow passengers to transfer between the Tōkaidō Shinkansen and Kusatsu lines. However, in September 2006, the Otsu district court concluded that Ritto City issuing bonds to fund the station's construction was illegal under local finance law and the project was halted; the project was officially abandoned in October 2007.
| Tsuge Station | 柘植 | 0.0 | Kansai Main Line | Iga, Mie Prefecture | |
| Aburahi Station | 油日 | 5.3 | Kōka | Shiga Prefecture | |
| Kōka | 甲賀 | 7.4 | |||
| Terashō | 寺庄 | 10.5 | |||
| Kōnan | 甲南 | 12.5 | |||
| Kibukawa Station | 貴生川 | 15.3 | ■ Shigaraki Kōgen Railway Shigaraki Line ■ Ohmi Railway Main Line | ||
| Mikumo Station | 三雲 | 20.5 | Konan | ||
| Kōsei | 甲西 | 24.3 | |||
| Ishibe Station | 石部 | 27.6 | |||
| Tehara Station | 手原 | 32.7 | Ritto | ||
| Kusatsu | 草津 | 36.7 | Tokaido Main Line (Biwako Line) | Kusatsu | |
| Continuing service on the Biwako Line to Kyoto Station in mornings and evenings, and to Osaka Station in mornings only. | |||||
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