While browsing this rather excellent N-scale modelling site I can across these pages with some great photos, videos and useful information on Cajon Pass:
https://www.model160.com/workbench/n-scale-prototype-modeling/cajon-pass-nscale-model-railroad-project/cajon-pass-project-part-1-an-introduction-to-our-n-scale-project/
Goes to say V-Scale as offered by TS2018 or Run8v2 or MSTS/OR or Trainz/TANE has its advantages in capturing the "scale" of the real railroad and the landscape.