Union Pacific No. 4020

The Union Pacific 4020, or UP 4020, is a four-cylinder articulated 4-8-8-4 Big Boy-type steam locomotive owned by the Union Pacific Railroad. This locomotive was built by Alco in 1944 for the Union Pacific railroad.
The locomotive was used to haul fast freight on heavy grades, particularly on the Ogden-Wasatch district between Utah and Wyoming, but also over Sherman Hill just west of Cheyenne, WY. It ran in service until 1959, when it was retired along with the other Big Boy Locomotives.
It was scrapped shortly after.
== Trivia ==
* This is the first ever Big Boy locomotive built in the second batch.
Category:Union Pacific locomotives
Category:4-8-8-4 locomotives
Category:4-8-8-4 steam locomotives
Category:Steam locomotives
Category:Tender locomotives
Category:American locomotives
Category:Eight-coupled locomotives
Category:Articulated locomotives
Category:Built in 1944
Category:ALCO locomotives
Category:Freight locomotives
Category:Scrapped locomotives
Category:Locomotives
Category:American steam locomotives
Category:United States
Category:Scrapped steam locomotives
Category:Union Pacific Big Boy
Category:Standard gauge locomotives of the United States