A KiHa 120 DMU on the Sanko Line in June 2008
|Locale||Shimane and Hiroshima Prefectures|
|Daily ridership||50 passengers per km per day (FY2014)|
|Line length||108.1 km (67.2 mi)|
|Track gauge||1,067 mm (3 ft 6 in)|
|Operating speed||85 km/h (55 mph)|
The Sankō Line (三江線 Sankō-sen?) is a railway line in western Japan operated by West Japan Railway Company (JR West). The 108.1 km line connects Gōtsu in Shimane Prefecture with Miyoshi in Hiroshima Prefecture. Whilst the first section opened in 1930, the line was not completed until 1975, and features 30 tunnels. Due to declining patronage, the entire line is scheduled to close on 31 March 2018.
|Name||Between (km)||Distance (km)||Transfers||Location|
|Gōtsu||江津||-||0.0||Sanin Main Line||Gōtsu||Shimane Prefecture|
|Kuchiba||口羽||1.5||79.7||Ōnan, Ōchi, Shimane|
Services on the line are operated by JR West single-car KiHa 120 diesel multiple units.
The Gotsu to Kawato section opened in 1930, and the line was extended progressively east, reaching Hamahara in 1937. The Miyoshi to Shikijiki section opened in 1955 as a passenger-only line, and was extended to Kuchiba in 1963, and Hamahara in 1975, completing the line.
On 16 October 2015, JR West announced that it was considering closing the line due to poor patronage, and was in discussion with the two prefectures served by the line, Shimane and Hiroshima, as well as other municipalities served, concerning future plans. In fiscal 2014, the line carried an average of 50 passengers per km per day, compared to 458 per km per day in 1987. On 29 September 2016, JR West announced that the entire line will close on 31 March 2018.
- 三江線１８年３月末で廃線 [Sanko Line to close at end of March 2018]. Mainichi Shimbun (in Japanese). Japan: The Mainichi Newspapers. 29 September 2016. Archived from the original on 1 October 2016. Retrieved 1 October 2016.
- ＪＲ西：三江線、廃止も検討…人口減、利用低迷で [JR West considering closure of Sanko Line - declining population and poor patronage]. Mainichi Shimbun (in Japanese). Japan: The Mainichi Newspapers. 16 October 2015. Archived from the original on 2 November 2015. Retrieved 1 October 2016.
- 区間別平均通過人員および旅客運輸収入（平成26年度） [Average passenger figures and revenue by line (Fiscal 2014)] (pdf) (in Japanese). Japan: West Japan Railway Company. 2015. p. 58. Retrieved 17 October 2015.