| Dosan Line | |||
|---|---|---|---|
 Nanpū 2000 series DMU at Sanuki-Saida Station | |||
| Overview | |||
| Status | In operation | ||
| Owner |  JR Shikoku | ||
| Locale | Kagawa, Tokushima, Kōchi Prefectures | ||
| Termini | |||
| Stations | 61 | ||
| Service | |||
| Type | Heavy rail | ||
| History | |||
| Opened | 23 May 1889 | ||
| Completed | 12 November 1951 | ||
| Technical | |||
| Line length | 198.7 km (123.5 mi) | ||
| Number of tracks | 1 | ||
| Character | Rural | ||
| Track gauge | 1,067 mm (3 ft 6 in) | ||
| Minimum radius | 200 m (660 ft) | ||
| Electrification | 1,500 V DC overhead catenary (Tadotsu - Kotohira) | ||
| Operating speed | 120 km/h (75 mph) | ||
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Dosan Line (土讃線, Dosan-sen) is a railway line in Shikoku, Japan, operated by the Shikoku Railway Company (JR Shikoku). It connects Tadotsu Station in Tadotsu, Kagawa, and Kubokawa Station in Shimanto, Kōchi. The line links the city of Kōchi with northern Shikoku and the island of Honshū via the Seto-Ōhashi Line. The first section of the line between Tadotsu and Kotohira opened in 1889, Kochi was connected to the northern section of the line in 1935, and the western extension of the line was completed in 1951. The name of the line comes from "Tosa" (土佐) and "Sanuki" (讃岐), the old provincial names of present-day Kōchi Prefecture and Kagawa Prefecture, respectively.