Hello BigBoy4014...
I loved late Santa Fe steam locomotives as i have Sunset 3rd S.F.5011 class 2-10-4 and
wished it had a fan driven smoke unit. This engine is my strongest puller almost 4 pounds of pull. The key is to balance the driver sets. I had H.O. Scale brass United (PFM) 2-10-4
in the 1980's. I could put the fan driven smoke unit in but not sure which model to use.
Tiffany