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Union Pacific Heavy Challengers was a series of 4-6-6-4 "Challenger" type steam locomotivesthat were built by the American Locomotive Company (ALCO) for the Union Pacific Railroad, as of today, two are still in preservation, those two being Nos. 3977 and 3985.

History[]

TBA

Construction[]

All members were built by the American Locomotive Company

Preservation[]

Two examples have survived into preservation, those two being Nos. 3977 and 3985.

No. 3977[]

No. 3977 was built in 1943 as part of the 4664-4 Batch of Heavy Challengers and when it was spared from scrap, it was first relocated to Cody Park in October 1968.

As of today No. 3977 is still on static display in Cody Park.

No. 3985[]

No. 3985 was built in July 1943 as part of the 4664-4 Batch of Heavy Challengers and was spared from the scrap heap, and was stored with Big Boy No. 4023 where 3985 was restored by a group of employed volunteers in March 1981 and where it ran on excursion service until October 14, 2010. It masqueraded as Clinchfield Heavy Challenger No. 676 (the next member of the Clinchfield Railroad Heavy Challengers), it's fallen sister locomotive No. 3967, and as a What-If Scenario for when it would have been converted to burn oil in the steam era, it was retired on January 2020 and rested until April 2022, it was donated to Silvis Illinois along with TTT-6 No. 5511 and is currently undergoing restoration.

Stock list[]

4664-3[]

Status: All Members Scrapped

Image Loco No. Build date Notes
3950 1942
3951 1942
3952 1942
3953 1942
3954 1942
3955 1942
3956 1942
3957 1942
3958 1942
3959 1942
3960 1942
3961 1942
3962 1942
3963 1942
3964 1942
3965 1942
Union-pacific-challenger-1957-v0-r74hqw3fzs691.jpg 3966 1942
3967 1942 Hauled an excursion train before being scrapped.
3968 1942
3969 1942

4664-4[]

Image Loco No. Build date Status Notes
Ccc1ed1f87fe5a76b8f42104d3920aab 3975 1943 Scrapped
3976 1943 Scrapped
3977 1943 Preserved. On static display in Cody Park
3978 1943 Scrapped
3979 1943 Scrapped
3980 1943 Scrapped
3981 1943 Scrapped
3982 1943 Scrapped
Union Pacific 3983 3983 1943 Scrapped
Union Pacific No. 3984 3984 1943 Scrapped
3985 Golconda July 1992 - Flickr - drewj1946 3985 July 1943 Undergoing restoration to operating condition.
3986 1943 Scrapped
3987 1943 Scrapped
3989 1943 Scrapped
3990 1943 Scrapped Tender was reused in the creation of Union Pacific's GTEL Coal Burner
3991 1943 Scrapped
3992 1943 Scrapped
3993 1943 Scrapped
3994 1943 Scrapped
3995 1943 Scrapped
3996 1943 Scrapped
3997 1943 Scrapped
3998 1943 Scrapped
3999 1943 Scrapped

4664-5[]

Status: All Members Scrapped

Image Loco No. Build date Notes
3930 1944
3931 1944
3932 1944
3933 1944
3934 1944
3935 1944
3936 1944
3937 1944
3938 1944
3939 1944
3940 1944
3941 1944
3942 1944
3943 1944
3944 1944
3945 1944
3946 1944
3947 1944
3948 1944
3949 1944

Gallery[]

Union Pacific’s drawings

List of Union Pacific Challenger Locomotives
CSA-1: 3900 (3800)3901 (3801)3902 (3802)3903 (3803)3904 (3804)38053906 (3806)380738083909 (3809)3910 (3810)3911 (3811)3912 (3812)3913 (3813)3914 (3814)
CSA-2: 3815381638173918 (3818)38193820382138223823382238233824382538263827382838293830383138323833383438353836383738383839
4664-3: 39503951395239533954395539563957395839593960396139623963396439653966396739683969
4664-4: 3975397639773978397939803981398239833984398539863987398839893990399139923993399439953996399739983999
4664-5: 37303731373237333734373537363737373839393740374137423743374437453746374737483749
Clinchfield Railroad: Locomotive Type
Extinct: Fetter Challengers
Excursion Star: 39673985
Preserved: 39773985
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