Thanks. I got these in reeeeeally bad shape from an estate sale. They've been completely disassembled and reassembled a few times already. Such a PITA. At least I got the blue one working well, the warbonnet is a dummy unit.Very nice, there are some specific tips on the U-25, important to keep those funny rollers between the truck and chassis lubed!
I have some tips on my site:
Greg Elmassian web site on large scale trains and garden railroads, cigars, and computerselmassian.com
Note the 3 sub-pages... nothing other than lubrication needed now, but might be needed in the future.
I replace the traction tires on the USAT locos with "solid" wheels, improves power pickup, and while they pull a little less, (just add more locos) the improvement in power pickup is noticable. The skates can be problematic on switches.