Earlier today i was shocked to see No. 6936 involved in switching moves at Union Station. The crew didn't look too thrilled either. I was only able to watch it for about a minute, but that's a minute i won't forget. I know UP brings the steam through Denver and i've seen the Challenger but never the DDA40X! The little beacon was on and everything... Man i wish i had a digital camera; i didn't get no pictures either.