Union Pacific Big Boy 4014
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Union Pacific "Big Boy" Number 4014 on static display at the RailGiants Train Museum in Pomona, California
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| Type and origin | |
|---|---|
| References: | |
| Power type | Steam |
| Builder | American Locomotive Company |
| Serial number | 69585 |
| Build date | September 1941 |
| Specifications | |
|---|---|
| Configuration: |
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| • Whyte | 4-8-8-4 |
| • UIC | (2′D)D2′ h4 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 36 in (914 mm) |
| Driver dia. | 68 inches (170 cm) |
| Trailing dia. | 42 in (1,067 mm) |
| Wheelbase | 72 ft 5.5 in (22.09 m) |
| Length |
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| Width | 11 ft (3.4 m) |
| Height | 16 ft 2 1⁄2 in (4.94 m) |
| Adhesive weight | 540,000 lb (244,940 kilograms) |
| Loco weight | 762,000 lb (345,637 kilograms) |
| Tender weight | 342,200 lb (155,219 kilograms) (2/3 load) |
| Total weight | 1,250,000 lb (566,990 kilograms) |
| Fuel type | No. 5 Oil (Formerly Coal) |
| Fuel capacity | 28 short tons (25.4 t; 25.0 long tons) |
| Water cap | 24,000 US gal (91,000 l; 20,000 imp gal) |
| Firebox: • Firegrate area |
150 sq ft (14 m2) |
| Boiler | 95 in (2,400 mm) |
| Boiler pressure | 300 lbf/in2 (2.1 MPa) |
| Heating surface | 5,735 sq ft (533 m2) |
| • Tubes and flues | 5,035 sq ft (468 m2) |
| • Firebox | 720 sq ft (67 m2) |
| Superheater: |
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| • Type | Type A |
| • Heating area | 2,043 sq ft (190 m2) |
| Cylinders | 4 |
| Cylinder size | 23.75 in × 32 in (603 mm × 813 mm) |
| Performance figures | |
|---|---|
| Maximum speed | 80 mph (130 km/h) |
| Power output | 6,290 hp (4,690 kW) |
| Tractive effort | 135,375 lbf (602.18 kN) |
| Factor of adh. | 4.11 |
| Career | |
|---|---|
| Operators | Union Pacific Railroad |
| Numbers | 4014 |
| Nicknames | Big Boy |
| First run | 1941 |
| Last run | July 21, 1959 |
| Retired | December 7, 1961 |
| Restored | Commenced August 2013 |
| Current owner | Union Pacific Railroad, RailGiants Train Museum (Moved out for restoration since late 2013) |
| Disposition | Undergoing restoration for excursion service, and will be based on Cheyenne, Wyoming, in roundhouse once restoration is completed |
Union Pacific 4014, or UP 4014, is a four-cylinder articulated 4-8-8-4 Big Boy-type steam locomotive owned by Union Pacific Railroad. 4014 was retired from service on July 21, 1959, and donated to the Railway & Locomotive Historical Society in Pomona, California, in December 1961. The locomotive reached its destination in January 1962 and was displayed in Fairplex through 2013. Thereafter, Union Pacific 4014 was moved to Union Pacific's Steam Shop in Cheyenne, Wyoming, where it is now being extensively restored back to running condition. When 4014 returns to running condition, it will displace UP 3985 as the largest, heaviest and most powerful operational steam locomotive in the world.
UP 4014 was one of 25 4-8-8-4-class locomotives developed by Union Pacific and Alco to overcome problems with its 4-6-6-4 Challenger-class locomotives. It was determined that the goals that Union Pacific had set for its new class of locomotive could be achieved by making several changes to the existing Challenger design, including enlarging the firebox to about 235 by 96 inches (5.97 m × 2.44 m) (about 155 sq ft or 14.4 m2), lengthening the boiler, adding four driving wheels, and reducing the size of the driving wheels from 69 to 68 in (1,753 to 1,727 mm).
The Big Boys are articulated like the Mallet locomotive design, though without compounding. They were designed for stability at 80 miles per hour (130 km/h). They were built with a wide margin of reliability and safety, as they normally operated well below that speed in freight service. Peak horsepower was reached at about 35 mph (56 km/h); optimal tractive effort, at about 10 mph (16 km/h). The locomotive without the tender was the longest engine body of any reciprocating steam locomotive in the world.
Alco delivered No. 4014 to Union Pacific in December 1941 and it was retired on December 7, 1961. 4014 traveled 1,031,205 miles (1,659,564 km) for Union Pacific during its 20 years in service.
The last revenue train hauled by a Big Boy (No. 4015) ended its run in the evening of July 21, 1959. 4014 completed its last run earlier the same day at 1:50 in the morning. Most were stored operational until 1961, and four remained in operational condition at Cheyenne, Wyoming until 1962. Their duties were assumed by diesel locomotives and gas turbine-electric locomotives (GTELs). Of the 25 built, eight were preserved at various locations around the United States. In 1961, Union Pacific donated 4014 to the Southern California chapter of the Railway and Locomotive Historical Society; it reached its destination of Pomona on January 8, 1962.
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