Question: The Kaslo and Slocan Railway was a narrow gauge railway between Kaslo, Slocan, and the mining community of Sandon in the Kootenay region of British Columbia, it was operated originally by the Great Northern Railway, was an American Class I railroad, ruunning from Saint Paul, Minnesota, to Seattle, in which state?

Context paragraphs:
Kaslo and Slocan Railway: The Kaslo and Slocan Railway was a narrow gauge railway between Kaslo, Slocan, and the mining community of Sandon in the Kootenay region of British Columbia between 1895 and 1955 totalling about 53 km of track.  It was operated originally by the Great Northern Railway and later by the Canadian Pacific Railway.

Nashton, British Columbia: Nashton is a ghost town located in the West Kootenay region of British Columbia.  Nashton is located at the confluence of Keen Creek and the Kaslo River.  The town was founded in 1896 and originally called South Fork.  The Kaslo and Slocan Railway passed through the town on its way to Sandon.  South Fork became the shipping center for mines such as Alice-Utica, Cork-Province, and Montezuma.  South Fork's name was changed to Zwicky.  In 1898 the town contained several stores, hotel, and some houses.  In 1915 a post office was built and Zwicky was renamed Nashton.  The town lasted through several decades.  Stagecoaches such as Scott, Baker, and Company passed through Nashton.  Today Nashton is deserted.

Zincton, British Columbia: Zincton is a ghost town located in the West Kootenay region of British Columbia.  The town was located near Sandon, East of Slocan Lake.  The town of Zincton was built to support the mining efforts in the area.  Zincton was founded around 1892.  The ore predominantly found in the area was zinc.  Zinc was an unwanted metal at that time.  Much of the ore was shipped to the Pilot Bay smelter.  Zincton was destroyed by a forest fire in 1910.  In 1927 the Victoria Syndicate had acquired claims in the area and rebuilt the town.  The Kaslo and Slocan Railway line passed through Zincton.  Zincton was the largest producer of Zinc in the Slocan area.  The ore body was eventually depleted, and today Zincton is deserted.

Kaslo-Slocan: Kaslo-Slocan was the name of a provincial electoral district in the Canadian province of British Columbia centred on the town of Kaslo on Kootenay Lake as well as the mining towns of the "Silvery Slocan".  The riding first appeared in the 1924 election as the result of a merger of the former ridings of Kaslo and Slocan, and lasted until the 1963 election.

Rosebery, British Columbia: Rosebery is an unincorporated community on the east side of Slocan Lake in the Slocan Valley of the West Kootenay region of southeastern British Columbia, Canada, located north of the Village of New Denver.  Rosebery is a largely agricultural, recreation-retirement and resource community, with historical roots in the days of the Silvery Slocan silver-mining rush in the region and was important in the days of railway services in the valley which used the Rosebery Slip, a combined dock and roundtable serving steamboats on Slocan Lake and the Nakusp & Slocan Railway.

Slocan Park: Slocan Park is an unincorporated settlement in the Slocan Valley area of the West Kootenay region of the Interior of British Columbia, Canada.  Largely an agricultural and residential community of about 120 households, Slocan Park is the site of the co-operative grocery and gas outlet for the Slocan Valley, and other commercial services included a branch of the local credit union.

Slocan Lake: Slocan Lake is a lake in the Slocan Valley of the West Kootenay region of the Southeastern Interior of British Columbia, Canada.  it is drained by the Slocan River, which flows south from the lake's foot at Slocan City through the Slocan Valley to South Slocan, British Columbia, where that river meets the Kootenay River a few miles above its confluence with the Columbia.  It is fed by Bonanza Creek, which comes down the pass from Summit Lake, beyond which is the town of Nakusp on Upper Arrow Lake.

Three Forks, British Columbia: Three Forks is a ghost town located east of Slocan Lake, northeast of New Denver, in the Kootenays region of British Columbia.  The town was located at the forks of three creeks: Carpenter Creek, Seaton Creek, and Kane Creek.  Three Forks was founded in 1892 with the discovery of silver in the area.  The Nakusp and Slocan Railway passed through Three Forks.  In the summer of 1894, Three Forks was destroyed by a forest fire.  The town was rebuilt.  In 1897 Henderson's Gazeteer listed 15 businesses in Three Forks.  Three Forks contained six hotels: Brunswick, Black's, Richelieu, Wilmington, Slocan, and Miner's Exchange.  Madigan stagecoaches passed through Three Forks on the way to Cody or Sandon.  Pack trains of G.B. Matthews also passed through Three Forks.  Three Forks's best years were between 1892 and 1902.  By 1909 the town was in decline and nearby Sandon gained prominence.  A few old ruins are all that remains of Three Forks.

Regional District of Central Kootenay: The Regional District of Central Kootenay (RDCK) is a regional district in the province of British Columbia, Canada.  As of the 2006 census, the population was 55,883.  The area is 22,130.72 square kilometres.  The administrative centre is located in the city of Nelson.  Other municipalities include the City of Castlegar, the Town of Creston, the Village of Salmo, the Village of Nakusp, the Village of Kaslo, the Village of New Denver, the Village of Silverton, the Village of Ymir and the Village of Slocan (known locally as Slocan City to distinguish it from the appellation "the Slocan" for the entire Slocan Valley).

Great Northern Railway (U.S.): The Great Northern Railway (reporting mark GN) was an American Class I railroad.  Running from Saint Paul, Minnesota, to Seattle, Washington, it was the creation of 19th-century railroad entrepreneur James J. Hill and was developed from the Saint Paul & Pacific Railroad.  The Great Northern's (GN) route was the northernmost transcontinental railroad route in the U.S.

Supporting paragraphs: Kaslo and Slocan Railway Great Northern Railway (U.S.)
Answer: Washington