The 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.
11-698: 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
22-554: Is a tilting diesel multiple unit (DMU) train type operated by Shikoku Railway Company (JR Shikoku) on limited express services in Shikoku , Japan. An identical lone 4-car set is also operated by the Tosa Kuroshio Railway . The trains use stainless steel car bodies, and are powered by SA6D125-H engines. The tilting system uses active pendular suspensions. The prototype TSE ("Trans-Shikoku Experimental") set
33-529: 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. This article incorporates material from the corresponding article in the Japanese Misplaced Pages JR Shikoku 2000 series The 2000 series ( 2000系 , 2000-kei )
44-496: Is limited to 85 km/h due to the overhead catenary being a direct-line suspension system (similar to trams) as a result of a lack of funds during construction at the end of the JNR era. On the other hand, the diesel-powered limited express JR Shikoku 2000 series is able to run at 120 km/h, while regular diesel trains can run at 95 km/h. As such, the diesel trains operating in this section is able to run faster than electric trains. To reduce
55-537: The burden on the overhead catenary, electric trains operate with only one raised pantograph in addition to the speed limit. The overhead catenary of platform 1 at Kotohira Station is the only section along the entire line to have a Simple Catenary System typically used on electrified JR lines. After the privatization of JNR, there was a plan to electrify the Dosan Line to Awa-Ikeda along with the Yosan Line , but
66-528: The following services: JR Shikoku 2700 series The 2700 series ( 2700系 , 2700-kei ) is a tilting diesel multiple unit (DMU) train type operated by Shikoku Railway Company (JR Shikoku) and Tosa Kuroshio Railway on limited express services in Shikoku , Japan. The design is based on the 2600 series and features a red, gold, and green color scheme, described as "Neo Japonism". 2700 series sets consist of two or three cars, and are formed as follows. There are 12 first class seats in
77-404: The former did not come to fruition. The reasoning being the low return on investments due to the sharp decline in traffic south of Kotohira, and the many narrow tunnels making the installation of overhead wires difficult. As such, it was decided that a more rational plan was to introduce new high-speed diesel trains for limited express operations as opposed to electrification. In a 2006 submission to
88-535: The series 2800 cars. Two-car sets Three-car sets The interior features reclining seats with power sockets, a wheelchair space and an accessible toilet. LED lighting is used in order to reduce power consumption. The trains have stainless-steel car bodies, and are powered by two SA6D140HE-2 diesel motors. Instead of the pneumatic-spring suspensions of the 2600 series , the 2700 series use pneumatic pendular suspensions, allowing active tilt up to 5°. 40 cars were ordered from Kawasaki Heavy Industries as
99-728: The subcommittees of the Ministry of Land, Infrastructure, Transport and Tourism, JR Shikoku cited the electrification of the Kotohira - Kochi section as one of the desired long-term investments. Freight trains ceased operating between Tadotsu - Kochi in 2005. 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
110-471: 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 prior to the privatization of JNR. However, the maximum speed of electric trains in this section
121-489: Was introduced in 1989, and was the recipient of the 1990 Laurel Prize . Full-production sets followed in 1990. An improved version, designated as N2000, was introduced in 1995. These sets feature a higher power output. The TSE prototype set was withdrawn from revenue service in March 2018. 2000 series trains are gradually being replaced by new 2700 series trains since 2020. 2000/N2000 series trains are currently used on
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