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.

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List of Union Pacific Big Boy Locomotives

Real-Life Members:

4000 • 4001 • 4002 • 4003 • 4004 • 4005 • 4006 • 4007 • 4008 • 4009 • 4010 • 4011 • 4012 • 4013 • 4014 • 4015 • 4016 • 4017 • 4018 • 4019 • 4020 • 4021 • 4022 • 4023 • 4024

Fallen:

4000 • 4001 • 4002 • 4003 • 4007 • 4008 • 4009 • 4010 • 4011 • 4013 • 4013 • 4015 • 4016 • 4019 • 4020 • 4021 • 4022 • 4024

Preserved:

4004 • 4005 • 4006 • 4012 • 4014 • 4017 • 4018 • 4023

Preserved Union Pacific Locomotives
UP Class 700	No. 737
UP Class C-2	No. 237 • No. 264 • No. 561 • No. 616 • No. 618 • No. 6051 • No. 6237
UP Class C-57	No. 407 • No. 421 • No. 428 • No. 437 • No. 460 • No. 477 • No. 480 • No. 481 • No. 485
UP Class MK-1	No. 2005
UP Class MK-7	No. 2537
UP Class MK-9	No. 2295
UP Class MK-10	No. 2564
UP Class T-57	No. 1242 • No. 1243
UP Class P-1	No. 3206
UP Class P-2	No. 3203
UP Class TTT-6	No. 5511
UP Class S-4	No. 4420
UP Class S-5	No. 4436 • No. 4439 • No. 4442
UP Class S-6	No. 4455 • No. 4466
UP Class FEF-1	No. 814
UP Class FEF-2	No. 833
UP Class FEF-3	No. 838 • No. 844
UP Class 9000	No. 9000
UP Heavy Challengers	No. 3977 • No. 3985
UP Big Boys	No. 4004 • No. 4005 • No. 4006 • No. 4012 • No. 4014 • No. 4017 • No. 4018 • No. 4023

Union Pacific No. 4005

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