Burlington Northern Class SD40-2 Number 6709, built February 1976; SD40-2 Number 6754, built December 1976; SD40-2 Number 6752, built March 1976; passing Hoffman Avenue interlocking in Saint Paul, Minnesota with eastbound loaded ore jennies on February 10, 1982. Photo by Al Christianson.

Burlington Northern Class SD40-2 Number 6709, built February 1976; SD40-2 Number 6754, built December 1976; SD40-2 Number 6752, built March 1976; at Chemolite, Minnesota with eastbound loaded ore jennies on February 10, 1982. Photo by Al Christianson.

Burlington Northern Class SD40-2 Number 6708, built February 1976; SD40-2 Number 6754, built December 1976; SD40-2 Number 6726, built February 1976; at Newport, Minnesota with eastbound loaded ore jennies on May 30, 1980. Photo by Al Christianson.

Burlington Northern Class SD40-2 Number 6708, built February 1976; SD40-2 Number 6754, built December 1976; and SD40-2 Number 6726, built February 1976; at Newport, Minnesota with eastbound loaded ore jennies, including Northern Pacific hopper Number 78455, Great Northern hopper Number 92*83, and Great Northern hopper Number 91867, on May 30, 1980. Photo by Al Christianson.

Burlington Northern Class SD40-2 Number 6708, built February 1976; SD40-2 Number 6754, built December 1976; SD40-2 Number 6726, built February 1976; at Newport, Minnesota with eastbound loaded ore jennies, including including Northern Pacific hopper Number 78455 and Great Northern hopper Number 92*83, on May 30, 1980. Photo by Al Christianson.

Burlington Northern Class SD40-2 Number 6707, built December 1974; an SD45, number unknown; and SD40-2 Number 6776, built May 1977; at Northtown diesel shop in Minneapolis, Minnesota on June 5, 1980. (former Northern Pacific sand hopper in background. Photo by Al Christianson.

Burlington Northern Class F45 Number 6630, built April 1971; SD40-2 Number 6833, built November 1973; SD40-2 Number 67*5; and an SD45, number unknown; at Northtown yard in Minneapolis, Minnesota on July 26, 1980. Photo by Al Christianson.

Burlington Northern Class F45 Number 6626, built April 1971; SD40 Number 6324, built November 1971; F45 Number 6625, built September 1970; SD45 Number 6571, built October 1971; at Minneapolis, Minnesota on August 10, 1981. Photo by Al Christianson.

Burlington Northern Class F45 Number 6621, built August 1970; SD40-2 Number 6808, built March 1973; an SD45, number unknown; and an SD45, number unknown; passing Hoffman Avenue interlocking at Saint Paul, Minnesota with a westbound freight on February 17 1980. Photo by Al Christianson.

Burlington Northern Class F45 Number 6617, built August 1970; SD40-2 Number 7889, built May 1979; at Minneapolis, Minnesota on November 15, 1980. Photo by Al Christianson.