Here's some old pictures of what the route is really based off, what the real engineers would of had to face when crossing a route very much like this route for RW.
If you know of any other cliffside track pictures post them up and I might be able to use them as reference to how I build some of the route. Once out of the desert part of the route the track will run past tree land very much like these.
Some of the cliffside tracks would have really been hundreds of feet in the air on the edge of a mountain.
As well, I've uploaded a preview video of the route here. http://railworksamerica.com/forum/viewtopic.php?f=42&t=5350