The DRGW challengers built by ALCo were originally meant to go to UP. DRGW had asked for more FTs, but the war production board decided to send them some of the newest batch of UP Challengers instead. DRGW was not impressed with their performance, finding the firebox was rather small for their liking (not to mention they were not as strong as the Baldwins that DRGW had ordered before). DRGW refused to buy them and instead leased them. They were sidelined as much as possible, and eventually transferred to Clinchfield.
-Ben