Union Pacific No. 4004

Union Pacific Railroad No. 4004 is a four-cylinder articulated 4-8-8-4 "Big Boy" type steam locomotive built by the American Locomotive Company (ALCO) in 1941 for the Union Pacific Railroad.
The locomotive spent many years working on the Union Pacific railroad hauling freight trains until it made its last run in 1958 and was retired. It then donated to the Holliday Park in Cheyenne, Wyoming in 1963. While being on display throughout the years, 4004 is in bad condition and needed a cosmetic restoration. The restoration was completed in 2018 and the locomotive remained in good condition ever since.
==Trivia==
*At one point in 1958 it was seen doubleheading a freight train with No. 4013.
*4004 isn't the only Big Boy to have a cosmetic restoration. 4012 has one too three years later in 2021.
*4004’s original Hancock 3 chime whistle was placed on Challenger 3985 in 1980, because 3985’s original whistle had been removed following retirement. It remained on the Locomotive for most of its excursion career until 2010 and retirement 2020. It remains on the locomotive stored in the Cheyenne roundhouse until 2022 when it was donated to the Railroading Heritage of Midwest America (RRHMA) to restore it back to operating condition. Meanwhile, a stock whistle was placed on 4004 during its 2018 cosmetic restoration.
*The engine can be seen side by side with fellow surviving Big Boy #4023 in Herron Rail Video's Articulateds America's Biggest Steam DVD.
==Gallery==
File:Big-boy-4013-and-4004-doubleheaders.jpg|Union Pacific No. 4004 and 4013 team up to doublehead a train over Sherman Hill on the way from Laramie to Cheyenne in August 1958.
File:Up4004.jpeg
File:6901827162361y1086088078.jpg
Category:Steam locomotives
Category:Tender locomotives
Category:American locomotives
Category:ALCO locomotives
Category:Freight locomotives
Category:Union Pacific locomotives
Category:Built in 1941
Category:Eight-coupled locomotives
Category:Articulated locomotives
Category:4-8-8-4 locomotives
Category:4-8-8-4 steam locomotives
Category:Locomotives
Category:United States
Category:Standard gauge locomotives
Category:Union Pacific Big Boy
Category:Preserved steam locomotives
Category:American steam locomotives
Category:Standard gauge locomotives of the United States