Alco C630 - Trains Magazine

The 10 UP units went to DMIR, where they only lasted a few years before moving on to northern Quebec's Cartier Railway.  All but one were scrapped in 1990, with the former UP 2907 eventually going to the Arkansas Railroad Museum, where it has been restored to its original colours.

To put it simply, ALCOs seemed to do better on railroads with shop forces that were used to them and would take the time to maintain them properly.  They are more fuel efficient than EMDs of the same era and have tougher GE traction motors, but seem to need more and somewhat different maintenance.  The 10 C630s would have been the odd ones out on Union Pacific, whereas Cartier was well known for their predominantly ALCO/MLW locomotive fleet and continued to run big 6-axle M-Liners into the 21st century.