Burlington Northern Class SD7 Number 6000 with a crewman riding the front steps, GP20 Number 2015 and an unidentified Burlington Northern Class EMD GP unit at Rothsay, Minnesota on February 20, 1982. Photo by Al Christianson. Number 6000 was built by Electro-Motive Division in May, 1952 as Great Northern Number 550, Builder Number 16099. It was retired in August, 1983. Number 2015 was built by Electro-Motive Division in May 60 as Great Northern Number 2015, Builder Number 25703. It was retired in August, 1985.