Burlington Northern diesel locomotive 7202 trailing helper engine and caboose 10079 on an eastbound coal train on Crawford Hill near Crawford, Nebraska on June 5, 1981. Number 7202 is an SD40-2 built by Electro Motive Division (EMD), builder's number A3804. BN 7204, builder's number A3806, is next ahead in the helper consist. Photo by Howard Patrick.

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 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 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 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 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 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 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 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.