Union Pacific No. 4005

Union Pacific No. 4005 is a 4-8-8-4 "Big Boy" type articulated steam locomotive built by the American Locomotive Company (ALCO) in 1941 for the Union Pacific Railroad (UP). It is one of the eight surviving Big Boys of the 25 locomotives of this type that were built for the UP between 1941 and 1944.
In December 1946, 4005 was converted to burn oil instead of coal, as part of an experiment as a result of a coal miners strike at the time. It is one of only two UP Big Boys to be converted to burn oil, the other one being No. 4014, which was restored to operating condition in May 2019 for excursion service. Unfortunately, the single burner that was installed in the firebox didn't heat it evenly. After putting up with fourteen months of poor fuel combustion, in March 1948, 4005 was converted back to burn coal, thus deeming the oil conversion a failure.
On April 27, 1953, 4005 derailed due to a misaligned switch. The first eighteen cars also derailed and were completely destroyed. Broken tractors, dead pigs, typewriters, and sewing machines were all over the wreckage. The engineer and the fireman were both killed instantly from the impact of the derailment. The brakeman was seriously injured but died two days later from his injuries. 4005 was eventually repaired and later retired from service in 1962, although it is possible that a different tender was used as part of the repairs. It was later donated to the Forney Transportation Museum in Denver, CO and put on static display where it remains as of today.
== Gallery==
File:4005 derailed in April 27 1953 flipped on it's side.jpeg|Union Pacific No. 4005 After Being Derailed
File:Union-Pacific-Big-Boy.jpg.webp
File:Union Pacific Big Boy No. 4005 (4 8 8 4) (26512531825).jpg
Category:4-8-8-4 locomotives
Category:4-8-8-4 steam locomotives
Category:Union Pacific locomotives
Category:American locomotives
Category:Steam locomotives
Category:Locomotives
Category:Articulated locomotives
Category:ALCO locomotives
Category:Tender locomotives
Category:Built in 1941
Category:Mallet locomotives
Category:Union Pacific Big Boy
Category:Freight locomotives
Category:American steam locomotives
Category:Preserved steam locomotives
Category:Standard gauge locomotives of the United States
Category:Forney Transportation Museum