Saw #4014 many times as a kid when it was parked at the fairplex rail museum in Pomona... never thought it would run again.
I went and saw it in 2019 on the first excursion trip after the restoration. They did a fantastic job on the restoration, and it's very, very impressive in person under steam.
Also very cool seeing how many people turned out to see it and chase it between stops, many of them were actually visiting from Europe to see it on the first public trip! If it makes a trip near you, I highly recommend going to check it out. Look at the route maps and plan it so you can catch it at a stop and walk around it, then try to find roads that parallel the tracks to try chase it for a bit or at least get up ahead and stand near the tracks when it passes by. Watch out though, as a lot of people keep their eyes on the train rather than the road...
Here's one of the pics from their first west coast run in 2019... it was going by about 30mph coming up to a public stop, and I may have been a bit too close the tracks to get some other spectators out of my shot, and I may or may not have been talked to by a nice UP rail policeman about keeping a safe distance from the tracks... LOL
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Another pic from later in the day as it was rolling to a station to pick up passengers for an passenger excursion trip...
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Kind of disappointing UP took #3985 off their roster once #4014 was up and running, but I can see trying to maintain 3 steamers being a labor and money pit (or more likely: "it wouldn't look good explaining the growing budget for the steam shop in our quarterly shareholders meetings when our freight keeps running behind schedule.") The good news is #3985 has now been donated to another organization who say they're going to restore it back to running order. Be interesting to see how much work it takes, UP's Steam Shop said #3985 is in need of another complete overhaul after all the miles put on it since they got it back on the rails in 1981. Be nice if the new caretakers get #3985 back up and running and arrange a double header with #4014.
If I lived in the Cheyenne area, I would probably see if they were taking volunteers to help in the steam shop... but they probably run a pretty tight crew.