Union Pacific Heavy Challenger

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 	
 	3966 	1942 	
 	3967 	1942 	Hauled an excursion train before being scrapped.
 	3968 	1942 	
 	3969 	1942 	
===4664-4===
Image	Loco No.	Build date	Status 	Notes
 	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 	
 	3983 	1943 	Scrapped 	
 	3984 	1943 	Scrapped 	
 	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==
*Gallery
Category:4-6-6-4 steam locomotives
Category:Built in 1944
Category:4-6-6-4 locomotives
Category:Union Pacific locomotives
Category:Built in 1942
Category:Built in 1943
Category:American steam locomotives
Category:American locomotives
Category:United States
Category:Standard gauge locomotives
Category:American locomotives
Category:4 foot 8 1⁄2 inch gauge
Category:American steam locomotives
Category:United States
Category:ALCO locomotives