I was fortunate enough to visit Leadville in December 1961 on a beautiful sunny day with wall to wall snow. It was a neat place, and as noted above most of the pieces still exist to make it a historically accurate restoration. And probably a nice standard guage steam operation in Colorado would be a good change of pace from C&TS, D&S and Loop.
The Royal Gorge is another such opportunity...a good place for one of the big standard guage engines that don't get out much to run a bunch of short trips in a very scenic location.
John West