Burlington Northern eastbound 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 eastbound coal train X200 with Wisconsin Power and Light hopper cars and caboose on the trestle over the Sheyenne River in Valley City, North Dakota on March 14, 1981. Photo by Al Christianson

Burlington Northern NW5 Number 995 and NW5 Number 993 with a variety of covered hoppers cross a small trestle near Wyndmere, North Dakota on March 11, 1981. Photo by Al Christianson.

Burlington Northern GP5 Number 1355, former Great Northern Number 905; F7B Number 717, former Northern Pacific Number 6009B; F7B Number 645, former Great Northern Number 314B; F7A number unknown; with freight in Fergus Falls, Minnesota on September 20, 1980. Photo by Al Christianson.

Burlington Northern GP5 Number 1355, two unidentified FB locomotives and an unidentified FA locomotive cross the Otter Tail river on a plate girder bridge at Fergus Falls, Minnesota on September 20, 1980. Photo by Al Christianson.

Burlington Northern GP5 Number 1355, former Great Northern Number 905; 3 unidentified F units in Fergus Falls, Minnesota on September 20, 1980. Photo by Al Christianson.

Burlington Northern SD40-2 Number 8141, built July 1980; SD40-2 number unknown; SD40-2 number unknown; approaching the high bridge at Valley City, North Dakota with an eastbound freight on March 14, 1981. Photo by Al Christianson.

Burlington Northern SD40-2 Number 8141, built July 1980; SD40-2 number unknown; SD40-2 number unknown; crossing the high bridge over the Sheyenne river at Valley City, North Dakota with an eastbound freight on March 14, 1981. Photo by Al Christianson.

Burlington Northern GP10 Number 1413 leads a manifest across the Mississippi River at Saint Cloud, Minnesota on June 7, 1981. Photo by Al Christianson.

Burlington Northern GP10 Number 1413, former Burlington Northern Number 1513 rebuilt October 1974 from former Great Northern GP7 Number 613; with westbound local freight crossing the Mississippi River bridge at Saint Cloud, Minnesota on June 7, 1981. Cars in sequence behind the engine are Potash Corporation of Saskatchewan covered hopper, unidentified gray covered hopper, Great Northern double plug door boxcar, Burlington Northern offset double door boxcar from Pacific Car & Foundary series 222550-222949, Southern Railway covered hopper, Rio Grande 4-bay open hopper. Photo by Al Christianson.