After downloading the "Rural Landscapes" and "Scale Roads" packages from 3dTrains, I went into the editor to place a few and see what they looked like. I cloned my "Castle Rock Railroad" route and started placing a few trees and bushes around at Monument Yard. It was fun enough that I decided to delete almost all the default scenery and rebuilt it all from scratch. Pretty easy to get to grips with, and an enjoyable project detailing things.
Here is the default Monument Yard:
And after a weekend of 'embellishing'.
The engine shed, looking back toward the new industrial park:
Engine Shed:
Turntable behind the Engine Shed:
The new industrial park, looking back toward the main yard:
Out at the old "end of line" just past Monument, I placed a large industrial complex to add a bit of mainline switching:
GP9 coming back from the "end of line" complex, passing the new passenger station:
Also added some point lights for night switching: