That's at the Colorado Railroad Museum (http://www.trainweb.org/rradventures/2006/2006-07-02_Colorado-RR-Museum-08.htm) near the backside of the Cornelius W. Hauck Restoration Facility.
Darren is right! I have a more modern D&RGW sign that U.P. has yet to modify. I'll get it loaded in my album soon. Ben