Union Pacific No. 4001

Union Pacific Railroad No. 4001 was a four-cylinder articulated 4-8-8-4 "Big Boy" type steam locomotive built by the American Locomotive Company in August 1941 for the Union Pacific Railroad.
The locomotive was scrapped in November 1961.
Category:Steam locomotives
Category:Tender locomotives
Category:Locomotives
Category:American locomotives
Category:ALCO locomotives
Category:4-8-8-4 locomotives
Category:4-8-8-4 steam locomotives
Category:Eight-coupled locomotives
Category:Articulated locomotives
Category:Built in 1941
Category:Scrapped locomotives
Category:Union Pacific locomotives
Category:Freight locomotives
Category:United States
Category:Standard gauge locomotives
Category:4 foot 8 1⁄2 inch gauge
Category:Wartime locomotives
Category:Scrapped steam locomotives
Category:Union Pacific Big Boy
Category:American steam locomotives
Category:Standard gauge locomotives of the United States
Category:Article stubs