Burlington Northern 6776 leading train in Minneapolis, Minnesota on October 23, 1980. Number 6776 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 766024-4. Photo by Al Christianson.

Burlington Northern 6779 leading train on Stone Arch Bridge in Minneapolis, Minnesota on October 14, 1980. Number 6779 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 766024-7. Photo by Al Christianson.

Burlington Northern 6799 leading coal train on Stone Arch Bridge in Minneapolis, Minnesota on June 2, 1981. Number 6799 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 776053-9. Photo by Al Christianson.

Burlington Northern 6799 leading coal train on Stone Arch Bridge in Minneapolis, Minnesota on June 4, 1981. Number 6799 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 776053-9. Photo by Al Christianson.

Burlington Northern 6799 leading coal train on Stone Arch Bridge in Minneapolis, Minnesota on June 4, 1981. Number 6799 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 776053-9. Photo by Al Christianson.

Burlington Northern eastbound manifest freight train crossing the trestle over the Sheyenne River at Valley City, North Dakota on March 14, 1981.