Soo Line Railroad Sheyenne River viaduct looking south bound at Valley City, North Dakota, on May 17, 2003. Photo by GJ Werkema. Other subject classes: bridge, viaduct

Great Northern Railway work train on Gassman Coulee bridge at Minot, North Dakota in 1969. Other subject classes: Bridge

Great Northern Railway Work train on Gassman Coulee bridge at Minot, North Dakota in 1969. Other subject classes: Bridge

Great Northern potash train crossing Gassman Coulee bridge west of Minot, North Dakota, circa 1968. Other subject categories: Freight

Great Northern Bridge at Karnak, North Dakota, May 19, 2003, over the Sheyenne River. Other subject classes: Structure, Bridge

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 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.

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 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.