I mount mine vertically directly beneath the layout. I don't notice any significant dust buildup. My layout is in the "habitable" part of the house, though, not a garage or basement, and there isn't much dust anyway.
It takes an iron man to play with a toy iron horse.
Upgraded to NCE Pro R and PSX breakers. Concern is dust eventually accumulating on PSX's. Can they be mounted in an enclosure or do they airflow during use?
Thanks.