Quote: = NayBreak
Sure - from A-Basin on the access to the East Wall traverse. Note usage of both double black and double black E X.
That helps a lot!
The first time I noticed E X was at Aspen last season. At Snowmass the access traverses to E X terrain from the top of a couple lifts are marked E X on the trail map. In contrast, the traverse from the top of the Cirque poma to Hanging Valley is Double Black. Needless to say, it's not the traverse that's hard but the terrain once you get over there. In the Highlands Bowls, only one marked trail is E X, the others are Double Black. At Ajax, only Traynor Ridge is E X.
I took a look at my CO trail map collection. Collected a few in recent years driving around Colorado. A-Basin and Loveland have a lot of Double Black E X terrain.
Crested Butte doesn't use E X at all. Instead Crested Butte uses Green, Double Green, Blue, Double Blue, Black, Double Black and stick the word "Advanced" in at every chance, as in Advanced Beginner, Advanced Intermediate, then Advanced, and finally Advanced/Expert.
Steamboat uses Blue-Black and Double Black E X, but not Double Black. The trail map I picked up at a highway rest stop this winter has all the words that marketing can think of. The older trail map legends didn't include the terms "Intermediate" or "Expert." The E X terrain includes the chutes on Morningside and the upper part of Mt. Werner.
Steamboat Trail Map Legend 2015-16
EASIER - Green (circle)
MORE DIFFICULT-INTERMEDIATE - Blue (square)
MORE DIFFICULT-ADVANCED INTERMEDIATE - Blue-Black (blue square with a black diamond inside)
MOST DIFFICULT - Black (diamond)
EXTEME TERRAIN-EXPERTS ONLY - Double Black (two diamonds)