Not my hobby, but I was impressed beyond belief when I took the kids to visit. The tracks are HO scale and the canyons are approx. 10 - 12 feet deep. Could only wish for that sort of spare time eh?
https://www.milsurps.com/images/impo...IMG_2805-1.jpg
https://www.milsurps.com/images/impo...IMG_2823-1.jpg
https://www.milsurps.com/images/impo...IMG_2806-1.jpg
https://www.milsurps.com/images/impo...IMG_2832-1.jpg
https://www.milsurps.com/images/impo...IMG_2756-1.jpg
Ian