Eastbound freight Number 80 crossing the Gassman Coulee bridge near Minot, North Dakota on February 19, 1981. Four Burlington Northern cabooses on the rear, following a mix of mainly 20 foot international containers on Trailer Train flatcars. Photo by Al Christianson.

Burlington Northern SD45, number unknown; SD40-2 number unknown; SD40-2 number unknown; U33C number unknown; with eastbound freight Number 82 crossing the Gassman Coulee bridge near Minot, North Dakota on February 19, 1981. Photo by Al Christianson.

Milwaukee Road SD40-2 number unknown; Burlington Northern SD40-2 number unknown; Burlington Northern SD40-2 number unknown; Burlington Northern SD40-2 number unknown; with eastbound loaded coal X200 at Valley City, North Dakota on March 14, 1981. Unit train of WISX gondolas, owned by Wisconsin Power and Light. Photo by Al Christianson.

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

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 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.

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

Burlington Northern westbound intermodal train Number 23 crossing the Stone Arch Bridge over the Mississippi River at Saint Anthony Falls in Minniapolis, Minnesota on October 14, 1980. Photo by AL Christianson

Burlington Northern Yakima River bridge at Union Gap, Washington, on October 20, 2008. This former Northern Pacific structure is in their 3rd subdivision of the Idaho division. Photo by GJ Werkema. Subject Classes: bridge, Yakima River

Burlington Northern Yakima River bridge east of Easton, Washington, on April 1, 1987. This former Northern Pacific structure is in the 1st subdivision of the Tacoma division. Photo by GJ Werkema. Subject Classes: bridge, Yakima River

Burlington Northern Yakima River bridge east of Easton, Washington, on April 1, 1987. This former Northern Pacific structure is in the 1st subdivision of the Tacoma division. Photo by GJ Werkema. Subject Classes: bridge, Yakima River

Burlington Northern Yakima River bridge east of Easton, Washington, on April 1, 1987. This former Northern Pacific structure is in the 1st subdivision of the Tacoma division. Photo by GJ Werkema. Subject Classes: bridge, Yakima River

Burlington Northern Yakima River bridge east of Easton, Washington, on April 1, 1987. This former Northern Pacific structure is in the 1st subdivision of the Tacoma division. Photo by GJ Werkema. Subject Classes: bridge, Yakima River

Burlington Northern Yakima River bridge east of Easton, Washington, on April 1, 1987. This former Northern Pacific structure is in the 1st subdivision of the Tacoma division. Photo by GJ Werkema. Subject Classes: bridge, Yakima River

Burlington Northern Yakima River bridge east of Easton, Washington, on April 1, 1987. This former Northern Pacific structure is in the 1st subdivision of the Tacoma division. Photo by GJ Werkema. Subject Classes: bridge, Yakima River

Burlington Northern Yakima River bridge east of Easton, Washington, on April 1, 1987. This former Northern Pacific structure is in the 1st subdivision of the Tacoma division. Photo by GJ Werkema. Subject Classes: bridge, Yakima River

Canadian Pacific Railway trestle bridge CP 354 at Mountain Creek, BC, circa 1900. A worktrain led by a 4-4-0 class locomotive, Canadian Pacific Railway 354 on the high timber trestle at Mountin Creek in Beaver Valley in the Selkirk Mountains of British Columbi, Canada. Workers with shovels pose on flat cars loaded with dirt or gravel. J.M. Fredrickson collection. Other Subject Classes: trestle, river

Chicago Milwaukee and Puget Sound and Columbia and Puget Sound Railroad bridges at Maple Valley, Washington in November 1911. Steel truss and timber trestles both damaged by Cedar River flood, road bridge still standing. Other Subject Classes: railroad bridges.

Chicago Milwaukee and Puget Sound Railroad bridge at Maple Valley, Washington in November 1911. Steel truss bridge damaged by Cedar River flood. Other Subject Classes: railroad bridges.

Chicago, Milwaukee and Puget Sound Railroad bridge at Maple Valley, Washington, in November 1911. Looking north at steel truss bridge damaged by flood. One man killed repairing bridge. Other Subject Classes: railroad bridges.

Columbia & Puget Sound Railroad truss bridge at Maple Valley, Washington in November 1911. Maple Valley Bridge 13 damage, November, 1911. Other Subject Classes: truss bridge.

Columbia and Puget Sound Railroad bridge at Elliott, Washington in November 1911. Steel Howe truss bridge damaged by flood. Other Subject Classes: railroad bridges.

Columbia and Puget Sound Railroad bridge at Elliott, Washington, in 1894. Wood truss bridge under construction over Cedar River near present Maplewood Golf Course between Elliott and Renton, workers. Large wheel on top of bridge was a giant wrench to tighten the nuts.. Other Subject Classes: railroad bridges, railroad employees.

Columbia and Puget Sound Railroad bridge at Maple Valley, Washington in November 1911. Wood truss span damaged by flood. Other Subject Classes: railroad bridges.

Columbia and Puget Sound Railroad bridge at Maple Valley, Washington in November 1911. Wood truss span damaged by flood. Other Subject Classes: railroad bridges.

Columbia and Puget Sound Railroad bridge at Maple Valley, Washington in November 1911. Wood truss span damaged by flood. Other Subject Classes: railroad bridges.

Columbia and Puget Sound Railroad bridge at Maple Valley, Washington, in November 1911. Timber trestle destroyed by Cedar River flood, looking west from the site of Chicago Milwaukee and Puget Sound Railroad bridge, road bridge beyond. Other Subject Classes: bridges.

Columbia and Puget Sound Railroad bridge at Maple Valley, Washington, in November 1911. Timber trestle destroyed by Cedar River flood, elevated view looking west from site of Chicago Milwaukee and Puget Sound Railroad bridge, road bridge beyond. Other Subject Classes: railroad bridges.