Nanpū 2000 series DMU at Sanuki-Saida Station
|Locale||Kagawa, Tokushima, Kōchi Prefectures|
|Line length||198.7 km (123.5 mi)|
|Number of tracks||1|
|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)|
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.
The first section opened, between Tadotsu and Kotohira, was constructed by the Sanuki Railway Co. in 1889. The company was nationalised in 1906.
The Kotohira - Awa Ikeda section was opened in 1914 and connected to the Tokushima line.
The Susaki - Kochi - Kusaka section opened in 1924, and was extended north in sections 1925-35, where it connected to the northern section at Minawa, the line from Awa Ikeda having been extended there in 1931.
The Susaki - Tosakume section opened 1939, with extensions to Kageno opening 1947 and to Kubakawa in 1951.
CTC signalling was commissioned between Tadotsu - Kochi in 1967, and the 4,180m Oboke tunnel and associated realignment opened the following year.
The 2,583m Osugi tunnel and associated realignment opened in 1973. CTC signalling was extended to Kubokawa in 1986, and the Tadotsu - Kotohira section was electrified the following year.
Freight trains ceased operating between Tadotsu - Kochi in 2005.
Former connecting lines
- Kotohira station - The Kotohira Express Railway Co. operated a 16 km line to Sakaide on the Yosan Line 1930-44, with the line formally closing in 1954.
- Tadotsu station - The Kotohira Sangu Railway Co. operated a 27 km line to Sakaide 1922/28 - 1963, with a 7 km branch to Kotohira operated 1923-63.
Nanpū (南風?) limited express trains make 14 round-trips per day between Okayama and Kōchi, Nakamura, or Sukumo. Shimanto (しまんと?) limited expresses make five round trips per day between Takamatsu and Kōchi, Nakamura, or Sukumo. The Sunport (サンポート?) rapid service trains link Kotohira and Takamatsu once an hour.
The line is generally divided into three parts for local services at Awa-Ikeda and Kōchi. For the segment between Tadotsu and Kotohira, there are through services to/from Okayama and Takamatsu. The Tosa Kuroshio Railway Gomen-Nahari Line has through service to/from Kōchi.
- Local trains generally stop at all stations, but sometimes skip stations marked "▽".
- Sunport (Takamatsu - Tadotsu - Kotohira) rapid trains stop at all stations on the Dosan Line.
- See the articles on the Nanpū and Shimanto limited express services for details of station stops.
- Trains are able to pass each other at stations marked "◇" and "◆" (switchback); trains cannot pass at stations marked "｜".
|Station No.||Station name||Japanese||Distance (km)||Transfers||Location|
|Through service to/from the Yosan Line and the Seto-Ōhashi Line|
|D12||Tadotsu||多度津||-||0.0||■ Yosan Line (Y12) (some trains through to Utazu)||◇||Tadotsu, Nakatado District||Kagawa|
|D15||Kotohira||琴平||5.3||11.3||Kotoden Kotohira Line (Kotoden-Kotohira)
Electrified section ends at this station
|◇||Kotohira, Nakatado District|
|D16||Shioiri||塩入||6.4||17.7||◇||Mannō, Nakatado District|
|D21||Tsukuda||佃||3.4||38.8||■ Tokushima Line (B24)||◇|
|D22||Awa-Ikeda||阿波池田||5.1||43.9||■ Tokushima Line (B25)||◇|
|D28||Tosa-Iwahara||土佐岩原||7.2||72.7||◇||Ōtoyo, Nagaoka District||Kōchi|
|D40||Gomen||後免||2.1||116.2||Tosa Kuroshio Railway Gomen-Nahari Line (some trains through to Kōchi; GN40)||◇|
|Kōchi||高知||2.1||126.6||Tosaden Sanbashi Line (Kōchi-Ekimae)||◇|
|K03||Asahi||旭||1.5||130.2||Tosaden Ino Line (Asahi-Ekimae-Dōri)||◇|
|K04||Kōchi-Shōgyō-Mae||高知商業前||1.1||131.3||Tosaden Ino Line (Kagamigawabashi)||｜|
|K05||Asakura||朝倉||1.4||132.7||Tosaden Ino Line (Asakura-Ekimae)||◇|
|K06||Edagawa||枝川||3.5||136.2||Tosaden Ino Line (Edagawa)||｜||Ino, Agawa District|
|K07||Ino||伊野||1.8||138.0||Tosaden Ino Line (Ino-Ekimae)||◇|
|K08-1||Omura-Jinja-Mae||小村神社前||2.1||141.6||｜||Hidaka, Takaoka District|
|K11||Tosa-Kamo||土佐加茂||2.9||148.6||◇||Sakawa, Takaoka District|
|K22||Tosa-Kure||土佐久礼||6.1||179.7||◇||Nakatosa, Takaoka District|
|K23||Kageno||影野||10.7||190.4||◇||Shimanto, Takaoka District|
|K26||Kubokawa||窪川||4.5||198.7||Tosa Kuroshio Railway Nakamura Line (TK26) (all JR Shikoku Yodo Line trains run through to Kubokawa)||◇|
This article incorporates material from the corresponding article in the Japanese Wikipedia
|Wikimedia Commons has media related to Dosan Line.|
- JR Shikoku official website (Japanese)