Dosan Line

The name of the track of the Shikoku Railway Company. The 198.7 km section between Tadotsu (Kagawa Prefecture) and Kochi-Kubokawa (Kochi Prefecture) is a single track line. Only the 11.3 km section between Tadotsu and Kotohira is electrified. It is one of the main railway lines in Shikoku, running from southwest to northeast across Kochi Prefecture, passing through the upper reaches of the Yoshino River and the Sanuki Mountains to the Sanuki Plain. The Sanuki Railway opened the Tadotsu-Kotohira section in 1889 (Meiji 22), and after being purchased by the Sanyo Railway, it was nationalized in 1906 (Meiji 39). When the name of the national railway line was established, it became part of the Sanuki Line (later the Yosan Main Line and then the Yosan Line). Meanwhile, construction on the Kochi side continued under the name of the Kochi Line, and the Susaki-Kochi-Toyonaga section was opened between 1924 and 1934 (Taisho 13 and Showa 9). In 1935, the opening of the Minawa-Toyonaga section connected it to the Tokushima Main Line (now the Tokushima Line), and together with the Yosan Main Line's Tadotsu-Awa-Ikeda section (completed in 1929) and the Tokushima Main Line's Awa-Ikeda-Minawa section (opened in 1931), the line became the Dosan Line. The line was then extended into the mountainous region of southwestern Kochi Prefecture, reaching Kubokawa by 1951 (Showa 26), and in 1963 it became the Dosan Main Line. In 1987, with the division and privatization of the Japanese National Railways, it came under the control of the Shikoku Railway Company, and in 1988 it was renamed the Dosan Line again.

[Eiichi Aoki and Ryo Aoki]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

四国旅客鉄道の線路名称。多度津(たどつ)（香川県）―高知―窪川(くぼかわ)（高知県）間198.7キロメートル、全線単線。多度津―琴平(ことひら)間11.3キロメートルのみ電化。高知県を南西―北東方向に縦断し、吉野川上流部と讃岐(さぬき)山地を抜けて讃岐平野に結ぶ四国の幹線鉄道の一つ。1889年（明治22）讃岐鉄道によって多度津―琴平間が開業、山陽鉄道による買収を経て、1906年（明治39）国有化。国有鉄道線路名称の制定とともに讃岐線（のち予讃(よさん)本線を経て予讃線）の一部となった。一方、高知側では高知線の名称で建設が進み、1924～1934年（大正13～昭和9）に須崎(すさき)―高知―豊永(とよなが)間を開業したが、1935年、三縄(みなわ)―豊永間の開業によって徳島本線（現、徳島線）と連絡し、予讃本線多度津―阿波(あわ)池田間（1929年全通）、徳島本線阿波池田―三縄間（1931年開業）をあわせて土讃線となった。その後、路線を高知県南西部の山地に延長し、1951年（昭和26）までに窪川に達して、1963年土讃本線となった。1987年、日本国有鉄道の分割民営化で、四国旅客鉄道に所属し、1988年ふたたび土讃線と改称した。

［青木栄一・青木　亮］

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