Regarding the RGS: If you take Wildcat Canon Rd (Co 141) west off of US 160 you will see lots of roadbed out to Pine Ridge, first on the right side as it comes around from 160A and goes up Wildcat Creek, then crossing to the left as you enter the Porter site. Before you leave US 160, look where the Southern crossed US 160 and you'll see the banks that were the ends of 160A. On the east side of the canon you can see the old Franklin Jct. yard.
Anyway, at Pine Ridge the roadbed disappears into Ft. Lewis and you have to go west to State 140. Turn right up to Hesperus but don't miss the Ute Jct. Coal tipple on the right before you get to hesperus.
The trick to finding Telluride's branch is to locate Vance Jct. where the old 8 pocket tipple still stands. The line to Telluride branched off there and went South to Anderson, then looped around and went back up the east side of the canon on the 4% of Keystone Hill. You can hike the roadbed from Anderson to Keystone. If you take State 145 north (west?) from the highway jct where the road goes off to Telluride, you can see the top of Keystone hill across the canon to the south and see Vance Jct in the valley below.
Have fun.