| Union Pacific "Big Boy" 4014 |
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Union Pacific No. 4014 charges towards the Norden snow shed at Donner Pass on July 14, 2024 |
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| Specifications |
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Configuration:
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| • Whyte | 4-8-8-4 |
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| • UIC | (2′D)D2′ h4 |
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| Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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| Leading dia. | 36 in (914 mm) |
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| Driver dia. | 68 in (1,727 mm) |
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| Trailing dia. | 42 in (1,067 mm) |
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| Minimum curve | 288 ft (88 m) radius/ 20° |
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| Wheelbase | - Locomotive: 72 ft 5+1⁄2 in (22.09 m)
- Overall: 117 ft 7 in (35.84 m)
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| Length | - Locomotive: 85 ft 7.8 in (26.11 m)
- Overall: 132 ft 9+7⁄8 in (40.48 m)
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| Width | 11 ft (3.35 m) |
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| Height | 16 ft 2+1⁄2 in (4.94 m) |
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| Axle load | 68,150 lb (30,912 kg) |
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| Adhesive weight | 545,200 lb (272.6 short tons) |
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| Loco weight | 772,250 lb (386.12 short tons) |
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| Tender weight | 441,500 lb (220.8 short tons) |
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| Total weight | 1,214,000 lb (607 short tons) |
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| Tender type | 25-C |
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| Fuel type | No. 5 fuel oil, originally coal |
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| Fuel capacity | Total: 6,500 US gal (25,000 L)
Usable: 6,100 US gal (23,000 L) |
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| Water cap. | 25,000 US gal (95,000 L) |
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| Sandbox cap. | 8,000 lb (4 short tons) |
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| Fuel consumption | 20–25 US gal (76–95 L) of fuel oil per mile
200 US gal (760 L) of water per mile |
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| Firebox: | |
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| • Grate area | 150 sq ft (grate removed in 2019) |
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Boiler:
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| • Model | Fire Tube |
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| • Diameter | 107 in (2,718 mm) |
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| • Tube plates | 22 ft (7 m) |
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| Boiler pressure | 300 lbf/in2 (2.1 MPa) |
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| Feedwater heater | Elesco Type T.P. 502 Exhaust Steam Injector
14,000 US gal / hour capacity |
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| Heating surface: | |
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| • Firebox | 704 sq ft (65 m2) |
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| • Tubes | 967 sq ft (90 m2) |
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| • Flues | 4,218 sq ft (392 m2) |
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| • Tubes and flues | 5,185 sq ft (482 m2) |
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| • Total surface | 5,889 sq ft (547 m2) |
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Superheater:
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| • Type | Type E |
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| • Heating area | 2,466 sq ft (229 m2) |
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| Cylinders | Four, outside |
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| Cylinder size | 24 in × 32 in (610 mm × 813 mm) |
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| Valve gear | Walschaerts |
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| Valve type | Piston valves |
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| Valve travel | 7 in (178 mm) |
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| Valve lap | 1+3⁄8 in (35 mm) |
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| Valve lead | 1⁄4 in (6 mm) |
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| Train heating | Steam heat |
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| Loco brake | Pneumatic, Schedule 8-ET |
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| Train brakes | Pneumatic |
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| Safety systems | Cab signals, PTC |
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| Performance figures |
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| Maximum speed | 65 mph (105 km/h) in regular service
80 mph (130 km/h) (maximum design) |
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| Power output | 8,157 hp (6,083 kW) @ Cylinder
6,290–7,000 hp (4,690–5,220 kW) @ Drawbar |
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| Tractive effort | 138,240 lbf (614.9 kN) |
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| Factor of adh. | 4.00 |
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| References: |
Union Pacific 4014 is a preserved 4884-1 class 4-8-8-4 "Big Boy" type steam locomotive owned and operated by the Union Pacific (UP) as part of its heritage fleet. Built in November 1941 by American Locomotive Company (ALCO) in Schenectady, New York, it was assigned to haul heavy freight trains in the Wasatch mountain range. The locomotive was retired from revenue service on December 7, 1961, and was donated to the Railway & Locomotive Historical Society; thereafter, it was displayed in Fairplex at the RailGiants Train Museum in Pomona, California.
In 2013, UP re-acquired the locomotive and launched a restoration project at its Steam Shop in Cheyenne, Wyoming. In May 2019, No. 4014 moved under its own power after sitting dormant for almost six decades, becoming the world's largest operational steam locomotive and the only operating Big Boy locomotive of the eight that remain in existence. It now operates in excursion service for the UP steam program. No. 4014 became the first mainline steam locomotive to be equipped with the positive train control (PTC) system in 2021.
