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| Seibu Tamagawa Line | |
|---|---|
 A Seibu Tamagawa Line train | |
| Overview | |
| Native name | 西武多摩川線 |
| Owner | Seibu Railway |
| Locale | Tokyo |
| Termini | |
| Stations | 6 |
| Service | |
| Type | Commuter rail |
| History | |
| Opened | 22 October 1917 |
| Technical | |
| Line length | 8.0 km (5.0 mi) |
| Number of tracks | 1 |
| Track gauge | 1,067 mm (3 ft 6 in) |
| Minimum radius | 300 m |
| Electrification | 1,500 V DC, overhead catenary |
| Operating speed | 95 km/h (60 mph) |
The Seibu Tamagawa Line (西武多摩川線, Seibu Tamagawa-sen) is an 8.0 km railway line in the western suburbs of Tokyo operated by the private railway operator Seibu Railway. The line connects Musashi-Sakai Station on the Chūō Main Line with Koremasa Station along the Tama River. The line has only six stations and is not directly connected to any other part of the Seibu Railway system (rather, only indirectly via a rarely used maintenance interconnection via the Chūō Main Line near Musashi-Sakai). The line is single-track: trains traveling in opposite directions pass each other as necessary at the stations, which are double-tracked.
Although the line is short, it provides access to the Tokyo University of Foreign Studies, the Tokyo Racecourse, the Ajinomoto Stadium, the Tokyo Metropolitan Police Department police school, many cemeteries (including Tokyo's largest, Tama Cemetery), the American School in Japan, and the Tama River.