"WhirlyBird" on the C&NW. Notice UP U50 43 behind CNW C628 6729 on this eastbound freight ready to depart CNW's East Minneapolis yard for Altoona and east. In late 1973 the CNW leased a hand full of Union Pacific U50s, nicknamed "WhirlyBirds", which were only used about 30 days before being returned to the UP. For background data on CNW's C628s see my photo of
CNW C628 6730.