An old CN unit, former GTW 6417 leads a colorful lash-up. I caught his twin GTW 6425 along with a slug coming off the HBR in Winnipeg back in 2004:
http://www.railroadforums.com/photos/showphoto.php?photo=16215
The 15s aren't bad either.
None of these engines are UP originals. From top to bottom: SP SW1500, MP GP15-1, C&O GP38, IC GP40 (Helm re-built to GP38-2), DTI GP40-2.