Burlington Northern Westbound grain train crossing the Gassman Coulee trestle in Minot, North Dakota on February 19, 1981. Photo by Al Christainson

Burlington Northern westbound empty coal train with Burlington Northern hopper cars on the trestle over the Sheyenne River in Valley City, North Dakota on February 20, 1981. Photo by Al Christianson.

A view of base of Burlington Northern water tank at Wishram, Washington, undated.

Burlington Northern water tank at Wishram, Washington, undated.

Burlington Northern viaduct at Weston, Washington, in 1979. View of steel viaduct, upper Green River valley. Photo by J.M. Fredrickson. Other Subject Classes: bridge, valley, mountain

Burlington Northern viaduct at Weston, Washington, in 1979. View of steel viaduct, upper Green River valley. Photo by J.M. Fredrickson. Other Subject Classes: bridge, valley, mountain

Burlington Northern viaduct at Weston, Washington, on June 8, 1970. Steel viaduct, man standing on former NP right of way. Photo by J.M. Fredrickson. Other Subject Classes: bridge, people, railroad right of way

Burlington Northern viaduct at Weston, Washington, on June 8, 1970. View of steel viaduct from below, unidentified man. Photo by J.M. Fredrickson. Other Subject Classes: bridge, people

Burlington Northern viaduct at Weston, Washington, circa 1985. View of steel viaduct, upper Green River valley. Photo by J.M. Fredrickson. Other Subject Classes: bridge, valley, mountain

Burlington Northern viaduct at Weston, Washington, circa 1980. Steel viaduct with Boy Scout troop. Photo by J.M. Fredrickson. Other Subject Classes: bridge, people