Union Pacific No. 3984

Union Pacific No. 3984 was a 4-6-6-4 steam locomotive that was built for the Union Pacific by the American Locomotive Company in 1943.
Category:Steam locomotives
Category:Locomotives
Category:Tender locomotives
Category:4-6-6-4 steam locomotives
Category:4-6-6-4 locomotives
Category:Union Pacific locomotives
Category:Standard gauge locomotives
Category:4 foot 8 1⁄2 inch gauge
Category:Standard gauge locomotives of the United States