Will Union Pacific 3985 Run Again?
It is one of 105 Challengers built for Union Pacific between 1936 and 1943 and was, for many years, the only operating engine of its class in the world – the largest and most powerful operating steam locomotive. That title has transitioned to Big Boy No. 4014 now that No. 3985 is retired again.
How many Challenger locomotives are left?
Preservation. Only two Challengers survive, both from the 4664-4 order built in 1943.
Union Pacific Challenger - Wikipedia
UP steam club article states 3985 "requires a frame up rebuild in the manner of 4014", ergo, it will be permanently retired. Financial cutbacks across railroad departments include the steam program. UP believe two active locomotive (and what locomotives they are) is sufficient for the moment.
UPRR announces retirement of 3985. - Railway Preservation ...
Where is Union Pacific 4014 right now?
CheyenneUnion Pacific reacquired No. 4014 from the RailGiants Museum in Pomona, California, in 2013, and relocated it back to Cheyenne to begin a multi-year restoration process....Vital Statistics.
Big Boy No. 4014 - Union Pacific
4014's restoration on May 1, 2019, No. 3985 was officially retired from excursion service in January 2020 due to its poor mechanical condition, with No. 4014 officially serving as the replacement for No. 3985.
Union Pacific 3985 - Wikipedia