Here is a nice variety of power working the 36th Street Yard, including a couple MP15DC units - one an ex Southern Pacific (UPY 1329) and one an ex Chicago & Northwestern (UPY 1321)
An odd lashup was working the UP's 36th Street Yard, including UPOY 613 (GP15-1), HLCX 3856 (GP38-2 - formerly a Grand Trunk Western GP40-2), and UPY 1321 (MP15DC).
UPY 613 (GP15-1 built for the Missouri Pacific in 1977) is often found working the 36th Street Yard shuffling freight cars, while the heavies wait for the assembled train.