Union Pacific Challenger

The Union Pacific Challengers are a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company (ALCO) from 1936 to 1944 and operated by the Union Pacific Railroad until the late 1950s.
A total of 105 Challengers were built in five classes. They were nearly 122 ft (37 m) long and weighed 537 short tons (487 tonnes). They operated over most of the Union Pacific system, primarily in freight service, but a few were assigned to the Portland Rose and other passenger trains. Their design and operating experience shaped the design of the Big Boy locomotive type, which in turn shaped the design of the last three orders of Challengers.
Two Union Pacific Challengers survive. The most notable is Union Pacific No. 3985, which was restored by the Union Pacific in 1981, then operated in excursion service as part of its heritage fleet program. Mechanical problems forced it out of service in October 2010; it was retired in January 2020 after the restoration of the 4-8-8-4 Big Boy 4014 and eventually donated to the Railroading Heritage of Midwest America in 2022, where the locomotive is undergoing a second restoration. The only other surviving Challenger is UP No. 3977, which is on display in North Platte, Nebraska.
== History ==
=== Description ===
The name "Challenger" was given to steam locomotives with a 4-6-6-4 wheel arrangement: four wheels in the leading pilot truck to guide the locomotive into curves, two sets of six driving wheels, and four trailing wheels to support the rear of the engine and its massive firebox. Each set of driving wheels is driven by two steam cylinders. In essence, the result is two engines under one boiler. Union Pacific developed five types of Challengers: the "light" CSA-1 and CSA-2 classes and the "heavy" 4664–3, 4664–4, and 4664-5 classes.
The railroad sought powerful locomotives that could handle mountain grades at high speeds. Previously, articulated locomotives had been limited to slow speeds by their design. Technical breakthroughs allowed the UP Challengers to operate with 280 lbf/in2 (1.93 MPa) boiler pressure, something usually reserved for passenger locomotives like the FEF Series. They had 69-inch (1,800 mm) drivers, mammoth wheels usually seen on passenger locomotives only because freight engines normally require the extra torque provided by smaller wheels.[clarification needed] Speeds in excess of 60 miles per hour (100 km/h), while unheard-of on most other railroads using articulated steam locomotives, became commonplace on the Union Pacific.
When the first Challengers entered service in 1936, on the UP's main line over the Wasatch Range between Green River and Ogden, the locomotives had problems climbing the steep grades. For most of the route, the maximum grade is 0.82% in either direction, but the climb eastward from Ogden, into the Wasatch Range, reached 1.14%. Hauling a 3,600-short-ton (3,300 t; 3,200-long-ton) freight train demanded double heading and helper operations and adding and removing helper engines slowed operations. Those limitations prompted the introduction of the Big Boy in 1941, as well as a redesign of the last three orders from 1942 to 1944.
Using the experience from the Big Boy, UP chief mechanical engineer, Otto Jabelmann, redesigned the last three orders of Challengers in 1941. The result was a locomotive in working order weighing some 317 short tons (288 t; 283 long tons) accompanied by a tender weighing 174 short tons (158 t; 155 long tons) when 2/3 loaded. Calculated tractive effort is 97,350 lbf (433.0 kN). From 1941, the Challengers were intended to speed up freight operations on the grades across Wyoming; the Wasatch Range climb east from Ogden was to be conquered by the Big Boys without helpers.
=== Construction[edit] ===
The 105 locomotives were ordered in five batches: the first two of light Challengers, and the final three of heavy Challengers. Along with the Big Boys, the Challengers arrived on the scene just as traffic was surging in preparation for American participation in World War II.
Table of orders and numbers
Class 	Quantity	Manufacturer 	Serial Nos.	Year built	UP No. 	Notes
CSA-1 	15 	American Locomotive Company	68745–68759	1936 	3900–3914	Converted to oil fuel in 1941–43; renumbered 3800–3814 in 1944. None preserved. All scrapped between 1957 and 1958.
CSA-2 	25 	American Locomotive Company	68924–68948	1937 	3915–3939	Converted to oil fuel; renumbered 3815–3839 in 1944. None preserved. All scrapped in 1958.
4664-3	20 	American Locomotive Company	69760–69779	1942 	3950–3969	3968 converted to oil fuel in 1946, renumbered 3944 in 1946. None preserved. All scrapped between 1958 and 1959.
4664-4	31 	American Locomotive Company	70158–70162
70169–70182
70678–70683	1943 	3975–3999	31 built but only 25 delivered to UP (see below); 3975–3984 converted to oil fuel in 1945; renumbered 3708–3717 in 1952. No. 3985 in excursion service from 1981 to 2010. 3977 preserved and on static display. Remainder scrapped in 1957.
4664-5	20 	American Locomotive Company	72792–72811	1944 	3930–3949	3930/31/32/34/37/38/43/44 converted to oil fuel in 1952 and renumbered 3700–3707. None preserved. All scrapped between 1957 and 1959.
As part of Union Pacific's fourth order in 1943, ALCO built thirty-one locomotives for Union Pacific using the same specifications. However, the War Production Board diverted six locomotives after completion to the Denver and Rio Grande Western Railroad via a lease through the War Department's Defense Plant Corporation. Locomotives 3900-3905 formed the Rio Grande's Class L-97. These were later sold to Clinchfield Railroad in 1947 and were renumbered as 670–675, where they formed the Clinchfield's Class E-3; these six Challengers were eventually retired in 1953.
== Preservation ==
Only two Challengers survive, both from the 4664-4 order built in 1943. No. 3977 is on static display in North Platte, Nebraska. No. 3985 was restored to operating condition by Union Pacific in 1981 and used in excursion service until mechanical problems sent it back into storage in October 2010. It was officially retired in January 2020 and stored in Cheyenne, Wyoming, but has since been acquired by the Railroading Heritage of Midwest America (RRHMA) in Little Silvis Shops in Silvis, Illinois, where the locomotive is now being restored to operation once again.
Surviving Challenger locomotives
Type 	Number	Image	Date built	Serial number	Location 	Coordinates 	Notes
4664-4	3977 	 	June 1943 	70160 	Cody Park, North Platte, Nebraska 	41.147853°N 100.753113°W 	
4664-4	3985 	 	July 1943 	70174 	Railroading Heritage of Midwest America, Silvis, Illinois	41°7′46.9308″N 104°48′49.1688″W	No. 3985 was restored in 1981 and used by Union Pacific on excursions until October 14, 2010, when mechanical problems forced it from service. It was officially retired from UP excursion service in January 2020. In April 2022, No. 3985 was donated to the RRHMA. In November 2022, the locomotive was sent to the RRHMA's workshops in Silvis, IL. Restoration work began in January 2023.
Category:Steam locomotives
Category:Tender locomotives
Category:Union Pacific locomotives
Category:Locomotives
Category:United States
Category:Standard gauge locomotives
Category:4 foot 8 1⁄2 inch gauge
Category:ALCO locomotives
Category:Articulated locomotives
Category:Passenger locomotives
Category:Freight locomotives
Category:6 Coupled locomotives
Category:4-6-6-4 locomotives
Category:4-6-6-4 steam locomotives