Union Pacific No. 4015

Union Pacific No. 4015 was 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 1941 along with the other Big Boy locomotives to address the problems concerning the preceding 4-6-6-4 Challenger class locomotives.
It was built for freight service on the Union Pacific railroad and ran in service until July 1959, when it was retired along with the other Big Boy Locomotives. It was sold for scrap shortly after.
Category:Steam locomotives
Category:Tender locomotives
Category:American locomotives
Category:ALCO locomotives
Category:Built in 1941
Category:Union Pacific locomotives
Category:4-8-8-4 steam locomotives
Category:4-8-8-4 locomotives
Category:Articulated locomotives
Category:Scrapped locomotives
Category:Locomotives
Category:Freight locomotives
Category:Scrapped steam locomotives
Category:Union Pacific Big Boy
Category:Standard gauge locomotives of the United States
Category:American steam locomotives