One amazing day in Cheyenne, Wyoming while taking pictures of Union Pacific's gas-turbines (see #4 in the background) I happened to see, sitting over in the dead line, Big Boy #4023.
I had heard that it was locked away in a roundhouse and that there were on-and-off discussions about trying to get her under steam again. I never expected to be able to see her but there she was getting a sunbath. To my utter amazment I was actually able to walk around to her sunny side and grab a snap while hanging on the side of some other car on the next track.
She hasn't ever been under steam again but she has been cosmetically restored beautifully and can be seen in today in a Park in Omaha, Nebraska