The Northern Pacific Railway (reporting mark NP) was a transcontinental railroad that operated across the northern tier of the western United States, from Minnesota to the Pacific Northwest. It was approved by Congress in 1864 and given nearly forty million acres (62,000 sq mi; 160,000 km2) of land grants, which it used to raise money in Europe for construction. Construction began in 1870 and the main line opened all the way from the Great Lakes to the Pacific when former President Ulysses S. Grant drove in the final "golden spike" in western Montana on September 8, 1883. The railroad had about 6,800 miles (10,900 km) of track and served a large area, including extensive trackage in the states of Idaho, Minnesota, Montana, North Dakota, Oregon, Washington, and Wisconsin. | 
