1941 American steam locomotive
Union Pacific "Big Boy" 4014 Union Pacific
Big Boy No. 4014 charges towards
Norden snow shed at
Donner Pass , July 14, 2024
Type and origin Power type Steam Designer Otto Jabelmann Builder American Locomotive Company (ALCO)Serial number 69585 Build date November 1941 Rebuild date July 2016–May 2019
Specifications Configuration: • Whyte 4-8-8-4 • UIC (2′D)D2′ h4 Gauge 4 ft 8+ 1 ⁄2 in (1,435 mm ) standard gauge Leading dia. 36 in (914 mm) Driver dia.68 in (1,727 mm) Trailing dia. 42 in (1,067 mm) Minimum curve 288 ft (88 m) radius/ 20° Wheelbase Locomotive: 5+ 1 ⁄2 in (22.09 m) Overall: 117 ft 7 in (35.84 m) Length Locomotive: 85 ft 7.8 in (26.11 m) Overall: 9+ 7 ⁄8 in (40.48 m) Width 11 ft (3.35 m) Height 2+ 1 ⁄2 in (4.94 m)Axle load 68,150 lb (30,912 kg) Adhesive weight 545,200 lb (272.6 short tons) Loco weight 772,250 lb (386.12 short tons) Tender weight 441,500 lb (220.8 short tons) Total weight 1,214,000 lb (607 short tons) Tender type 25-C Fuel type No. 5 fuel oil , originally coal Fuel capacity Total: 6,500 US gal (25,000 L) Water cap. 25,000 US gal (95,000 L) Sandbox cap. 8,000 lb (4 short tons) Fuel consumption 20–25 US gal (76–95 L) of fuel oil per mile Firebox: • Grate area 150 sq ft (grate removed in 2019) Boiler: • Model Fire Tube • Diameter 107 in (2,718 mm) • Tube plates 22 ft (7 m) Boiler pressure 300 lbf/in2 (2.1 MPa) Feedwater heater Elesco Type T.P. 502 Exhaust Steam Injector Heating surface: • Firebox 704 sq ft (65 m2 ) • Tubes 967 sq ft (90 m2 ) • Flues 4,218 sq ft (392 m2 ) • Tubes and flues 5,185 sq ft (482 m2 ) • Total surface 5,889 sq ft (547 m2 ) Superheater: • Type Type E • Heating area 2,466 sq ft (229 m2 ) Cylinders Four, outside Cylinder size 24 in × 32 in (610 mm × 813 mm) Valve gear Walschaerts Valve type Piston valves Valve travel 7 in (178 mm) Valve lap 1+ 3 ⁄8 in (35 mm)Valve lead 1 ⁄4 Train heating Steam heat Loco brake Pneumatic, Schedule 8-ET Train brakes Pneumatic Safety systems Cab signals, PTC
Performance figures Maximum speed 65 mph (105 km/h) in regular service Power output 8,157 hp (6,083 kW) @ Cylinder Tractive effort 138,240 lbf (614.9 kN) Factor of adh. 4.00
References:[ 2] [ 3] [ 4]
Union Pacific 4014 is a steam locomotive owned and operated by the Union Pacific (UP) as part of its heritage fleet . It is a four-cylinder simple articulated 4-8-8-4 "Big Boy " type built in 1941 by the American Locomotive Company (ALCO) at its Schenectady Locomotive Works . It was assigned to haul heavy freight trains in the Wasatch mountain range . The locomotive was retired from revenue service in 1959 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.[ 3] 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.
