• Operators, distances
  • Hokkaido Railway Company (Services and tracks)
    • Whole line, from Shin-Asahikawa to Abashiri: 234.0 km (145.4 mi)
  • Japan Freight Railway Company (Services)
    • From Shin-Asahikawa to Kitami: 181.0 km (112.5 mi)
• Signal boxes: 4
• Track: single
• Block system: Automatic

The Okhotsk limited express train, named after the Sea of Okhotsk, runs from Sapporo to Abashiri with two daily return workings. The Taisetsu limited express train runs from Asahikawa to Abashiri with two return workings daily. The limited rapid train Kitami operates between Asahikawa and Kitami, with one return service daily.

Local services along the line are roughly divided into three segments. In the segment between Asahikawa and Kamikawa, the line functions as a commuter rail of Asahikawa City. There is one local train service per one to two hours. The segment between Kamikawa and Engaru is a sparsely populated area. Between Kamikawa and Shirataki, a local train runs one lap per day. For the segment between Engaru and Abashiri, there is one local train service per one to two hours.

LE: Limited Express Okhotsk/Taisetsu

LR: Limited Rapid Kitami

All non-local trains stop at stations marked +, Some stop at those marked *, No such trains (other than local) stop at those marked -. Local trains may skip stations marked ◌.

Closed Stations edit

• Nakakoshi, Oku-Shirataki and Temmaku: Since 1 July 2001, of which Nakakoshi and Oku-Shirataki downgraded to signal bases
• Shin-sakaeno: Since 18 March 2006
• A44 Kami-Shirataki, A54 Kanehana, A46 Kyū-Shirataki and A47 Shimo-Shirataki: Since 26 March 2016, of which Kanehana and Shimo-Shirataki downgraded to signal bases

• A52 Ikuno, A33 Kita-Hinode, A36 Shōgunzan and A42 Tōun: Since 13 March 2021

The principal route between Sapporo and Okhotsk Subprefecture has changed several times. Originally, the route was the Hakodate Main Line to Asahikawa, then the southbound Nemuro Main Line and then the northbound line from Ikeda, via the Abashiri Main Line (網走本線, Abashiri-honsen) to Kitami. The route shortened by 53.5 km (33.2 mi) when the section between Takikawa and Furano on the Nemuro Main Line opened in 1913.^{[citation needed]}

Another route, northbound from Asahikawa to Nayoro, then southeast to Kitami was completed as the Nayoro Main Line (名寄本線, Nayoro-honsen) and Yūbetsu Line (湧別線, Yūbetsu-sen) in 1921.^{[citation needed]}

A third route was a shortcut between Asahikawa and Engaru, straight through the Kitami Pass. The Sekihoku Line (石北線, Sekihoku-sen), completed in 1932, finally completed the main route still used today.^{[citation needed]}

The current Sekihoku Main Line consists of the remnants of these three lines. The section between Shin-Asahikawa and Engaru is from the Sekihoku Line, the section between Engaru and Kitami from the Yūbetsu Line, and the section between Kitami and Abashiri from the Abashiri Main Line.^{[citation needed]}

The first of the abovementioned sections to open was from Abashiri to Kitami in 1912. The Kitami to Engaru line was opened between 1912 and 1915 as a 762 mm (2 ft 6 in) gauge line, but was converted to 1,067 mm (3 ft 6 in) gauge in 1916.^{[citation needed]}

The Asahikawa to Kamikawa section opened between 1922 and 1923, and the Engaru to Shiritaki section between 1927 and 1929. The final section, including the Ishikita tunnel, opened in 1932.^{[citation needed]}

In July 2015, JR Hokkaido announced that it would be closing four stations line (Shimo-Shirataki Station, Kyu-Shirataki Station, Kami-Shirataki Station, and Kanehana Station) in March 2016, due to low passenger usage.^[3]

• List of railway lines in Japan

• JR Hokkaido official website (in Japanese)
• JR Hokkaido official website (in English)