Big Boy 4004
4004 is displayed in Holliday Park on US 30 in Cheyenne. It was placed there during the summer of 1963. A 1985 rainstorm caused Holliday Park to flood so that water reached the top of 4004's drivers! ( those are 68 inchers) In 2001 there had been talk about moving 4004 from Holliday Park to the depot about 9 blocks away but this was only a rumor. In 2005, 4004 received some cosmetic work including a new paint job and lettering and new windows which greatly improved the locomotive's appearance. While the external appearance of 4004 is good, the cab interior, at least used to be a mess. Most of the controls had been removed by either wrench or torch, the firebox door is welded shut, and the seats are either gone or have deteriorated to springs.
Cheyenne is also the home of UP's steam program where both Challenger 3985 and Northern 844 (and a couple others) are housed. The Elesco cold water turbine pump and a Nathon water injector were removed from 4004 for use on Challenger 3985.
The above narrative courtesy: www.steamlocomotive.com/bigboy/