(This is the only Video left of my Train layout before I took it apart in 2012)
FWIW, I had a pair of Proto engines that arrived with cracked gears. I replaced the gears, and less than a year later, they had cracked again. I replaced those with Athearn gears, and had no more trouble.
When it absolutely, positively, has to get there (someday), ship on the ES&BM.
The other C&O BL2 that I have has Athearn F7 trucks under it. I ran out of the WKW wheel sets so I canabilized a F7 and replaced the entire truck. As a bonus the Bloomberg side frames are accurate.