Question: In what year did the railroad that built the High Bridge cease to operate?

full_context: Document 1: Maiden Lane Bridge: The Maiden Lane Bridge was a railroad bridge across the Hudson River between the city of Albany and Rensselaer County, New York. It was designed by Kellogg, Clark & Co., and was one of the largest bridges they designed. The bridge was owned and built by the Hudson River Bridge Company, which was owned jointly by the New York Central and Hudson River Railroad Company which owned 3/4, and the Boston and Albany Railroad Company which owned 1/4. The Maiden Lane Bridge was often referred to as the "South Bridge", while the Livingston Avenue Bridge was referred to as the "North Bridge". The Livingston Ave. Bridge was used for freight (and through-traffic passenger trains) while passenger trains used the Maiden Lane Bridge for access to Union Station, which was completed less than 10 months later. The state of New York authorized construction on May 10, 1869, construction began in May 1870, and the first train crossed on December 28, 1871. The bridge consisted of four 185.5 ft long fixed spans, one 274 ft long draw span, seven 73 ft long spans over the Albany Basin, one 110 ft long span over Quay Street, and one 63 ft long span over Maiden Lane. All the spans except the one over Maiden Lane were double tracked, through, and pin connected; the span over Maiden Lane was also double tracked, but was a deck and plate girder span. A reconstruction of the bridge, except for the draw span, was done in 1899 by Pencoyd Bridge Company and finished by January 3, 1900. The bridge lasted until the 1960s, when the Albany-Rensselaer Amtrak Station was built on the east side of the Hudson in the city of Rensselaer and Interstate 787 was built along the west side in Albany, thereby eliminating the need of the bridge.
Document 2: High Bridge (Latah Creek): High Bridge, a railroad bridge over Latah Creek in Spokane, Washington, was constructed in 1972 by the Burlington Northern Railroad, following that railroad's creation in 1970 through the merger of the Chicago, Burlington & Quincy, Great Northern, Northern Pacific, and Spokane, Portland & Seattle railways. The bridge links the former Northern Pacific mainline with the former Great Northern and Spokane, Portland & Seattle lines to the west. The Latah Creek railroad bridge and two bridges carrying Interstate 90 and Sunset Highway cross High Bridge Park.
Document 3: Highland Park and Lake Burien Railway: The Highland Park and Lake Burien Railway was a branch of the Interurban System that went from Everett to Tacoma in Washington state. A branch came off about Spokane Street going west to near the Steel Mill. It went up nearly parallel to Delridge Way to White Center then on to Burien to end just north of "Kirks Feedstore". It had one passenger car and frequently had a flat car attached for it also carried freight.
Document 4: Conrail: Conrail, the Consolidated Rail Corporation, (reporting mark CR) , was the primary Class I railroad in the Northeastern United States between 1976 and 1999, when its routes were split between the CSX Corporation and Norfolk Southern Railway. Conrail, a portmanteau of "consolidated" and "rail" from the name of the company, operates now as a joint-subsidiary for some limited functions.
Document 5: Spokane and Inland Empire Railroad: The Spokane and Inland Empire Railroad Company (S.&I.E.R.R.Co.) was an electrified interurban railway operating in Spokane, Washington and vicinity, extending into northern and central Idaho. The system originated in several predecessor roads beginning c. 1890, incorporated in 1904, and ran under its own name to 1929. It merged into the Great Northern Railway and later, the Burlington Northern Railroad, which operated some roads into the 1980s.
Document 6: Burlington Northern Railroad: The Burlington Northern Railroad (reporting mark BN) was a United States-based railroad company formed from a merger of four major U.S. railroads. Burlington Northern operated between 1970 and 1996.
Document 7: Soo Line High Bridge: The Soo Line High Bridge, also known as the Arcola High Bridge, is a steel deck arch bridge over the St. Croix River between Stillwater, Minnesota, and Somerset, Wisconsin. It was designed by structural engineer C.A.P. Turner and built by the American Bridge Company from 1910 to 1911. The bridge was listed on the National Register of Historic Places in 1977 for its national significance in the themes of engineering and transportation. It was nominated for its exceptional dimensions, beauty, innovative engineering techniques, and importance to transportation between Minnesota and Wisconsin.
Document 8: Billings Depot: The Northern Pacific Billings Depot is a historic train depot in the Historic District of downtown Billings, Montana. The depot was constructed to serve as a passenger station for the Northern Pacific Railway, Great Northern and Chicago, Burlington and Quincy. All three railroad merged to form the Burlington Northern Railroad in 1970, along with the Spokane, Portland and Seattle Railway. In 1971 Amtrak took over passenger service throughout the country.
Document 9: Chicago and North Western Transportation Company: The Chicago and North Western Transportation Company (reporting mark CNW) was a Class I railroad in the Midwestern United States. It was also known as the North Western. The railroad operated more than 5,000 miles (8,000 km) of track as of the turn of the 20th century, and over 12,000 miles (19,000 km) of track in seven states before retrenchment in the late 1970s. Until 1972, when the company was sold to its employees, it was named the Chicago and North Western Railway (or Chicago and North Western Railway Company).
Document 10: Burlington Northern Railroad Bridge 5.1: The Burlington Northern Railroad Bridge 5.1 or BNSF Railway Bridge 5.1, also known as the St. Johns Railroad Bridge or the Willamette River Railroad Bridge, is a through truss railway bridge with a vertical lift that spans the Willamette River in Portland, Oregon, United States. Built by the Spokane, Portland and Seattle Railway (SP&S) and completed in 1908, it was originally a swing-span bridge, and its swing-span section was the longest in the world at the time. However, 81 years later the main span was converted from a swing-type to a vertical-lift type, in order to widen the navigation channel. The lift span is one of the highest and longest in the world. The bridge consists of five sections, with the two sections closest to the bank on each side fixed.
Document 11: Robert Krebs: Robert D. Krebs has headed three major United States railroads in succession, leading the Southern Pacific (SP) when it was acquired by Santa Fe Industries, rising to lead the resulting Santa Fe Pacific Corporation, and finally being chosen to head the new Burlington Northern Santa Fe (BNSF) when Santa Fe Pacific (the holding company for the Santa Fe railroad) merged with Burlington Northern.
Document 12: Northern Transcon: The Northern Transcon, a route operated by the BNSF Railway, traverses the most northerly route of any railroad in the western United States. This route was originally part of the Chicago, Burlington and Quincy Railroad, Northern Pacific Railway, Great Northern Railway and Spokane, Portland and Seattle Railway systems, merged into the Burlington Northern Railroad system in 1970.
Document 13: Chicago, Burlington and Quincy Railroad: The Chicago, Burlington and Quincy Railroad (reporting mark CBQ) was a railroad that operated in the Midwestern United States. Commonly referred to as the Burlington or as the Q, the Burlington Route served a large area, including extensive trackage in the states of Colorado, Illinois, Iowa, Kansas, Kentucky, Missouri, Montana, Nebraska, Wisconsin, Wyoming, and also in New Mexico and Texas through subsidiaries Colorado and Southern Railway, Fort Worth and Denver Railway, and Burlington-Rock Island Railroad. Its primary connections included Chicago, Minneapolis-St. Paul, St. Louis, Kansas City and Denver. Because of this extensive trackage in the midwest and mountain states, the railroad used the advertising slogans "Everywhere West", "Way of the "Zephyrs"", and "The Way West". It merged into Burlington Northern in 1970.
Document 14: High Level Bridge (Edmonton): The High Level Bridge is a bridge that spans the North Saskatchewan River in Edmonton, Alberta, Canada. Located next to the Alberta Legislature Building, the bridge linked the separate communities of Edmonton and Strathcona, which became one city in 1912. It was designed from the outset to accommodate rail, streetcar, automobile and pedestrian traffic. The bridge was designated a Municipal Historic Resource in 1995. Trucks are prohibited on the bridge due to the low clearance of 3.2 m and substandard lane width. Currently street traffic is one-way southbound. At the north end of the bridge, 109 Street becomes the left lane, and 110 Street becomes the right lane. The next bridge downstream, the Walterdale Bridge, is a two-lane bridge with one-way northbound traffic into the downtown.
Document 15: Northern Securities Company: The Northern Securities Company was a short-lived American railroad trust formed in 1901 by E. H. Harriman, James J. Hill, J.P. Morgan and their associates. The company controlled the Northern Pacific Railway; Great Northern Railway; Chicago, Burlington and Quincy Railroad; and other associated lines. It was capitalized at $400 million, and Hill served as president.
ground_truth: 1996