I am not constrained by the real world as much as I am motivated by what I like. The model railroad's time frame is modern day, sort of. 

The main operating roads are Santa Fe and CSX.  SP and WP (for the California Zephyr) have trackage rights to access the passenger facilities. Both roads share trackage in a Berea, OH-like town in the desert southwest foot hills.

If you have a problem with Alco PAs sitting next to F40PHs, you might want to avoid the passenger locomotive photo section. If a SD70Mac pulling Vert-A-Packs creates stress, proceed with caution.  Just saying.