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

Related documents: [0]  [DOC] 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. [END] 
[1]  [DOC] 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. [END]  
Answer: 1996
1996