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.

Eastbound loaded coal X200 at Valley City, North Dakota on March 14, 1981. Unit train with WISX gondolas, owned by Wisconsin Power and Light. 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 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.