Burlington Northern 6805 leading train in Minneapolis, Minnesota on June 10, 1981. Number 6805 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 72639-6. Photo by Al Christianson.

Burlington Northern 6810 leading train at Dayton's Bluff in Saint Paul, Minnesota on March 24, 1981. Number 6810 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 72639-11. Photo by Al Christianson.

Burlington Northern 6928 leading train in Barnesville, Minnesota on February 20, 1982. Number 6928 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 73615-12. Photo by Al Christianson.

Burlington Northern 6928 leading train in Sabin, Minnesota on February 20, 1982. Number 6928 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 73615-12. Photo by Al Christianson.

Burlington Northern 7018 leading coal train in Birds, Texas on October 5, 1980. Number 7018 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 776053-28. Photo by Bill Phillips.

Burlington Northern 7066 leading coal train on Stone Arch Bridge in Minneapolis, Minnesota on December 26, 1979. Number 7066 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 776057-4. Photo by Al Christianson.

Burlington Northern 7066 leading coal train on Stone Arch Bridge in Minneapolis, Minnesota on December 26, 1979. Number 7066 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 776057-4. Photo by Al Christianson.

Burlington Northern 7132 leading train in Minneapolis, Minnesota on March 22, 1981. Number 7132 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 786173-7. Photo by Al Christianson.

Burlington Northern 7143 leading train in Fort Worth, Texas on June 15, 1980. Number 7143 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 786173-18.

Burlington Northern 7842 leading coal train in Minneapolis, Minnesota on February 8, 1981. Number 7842 is an SD40-2 built by Electro-Motive Division (EMD), builder's number 776057-23. Photo by Al Christianson.