Union Pacific 4014

Specifications
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: 72 ft 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: 132 ft 9+7⁄8 in (40.48 m);
Width	11 ft (3.35 m)
Height	16 ft 2+1⁄2 in (4.94 m)
Axle load	67,500 lb (30,617 kg)
Adhesive weight	540,000 lb (244,940 kg)
Loco weight	762,000 lb (345,637 kg)
Tender weight	436,500 lb (197,993 kg)
Total weight	1,198,500 lb (543,630 kg)
Tender type	25-C
Fuel type	No. 5 fuel oil, originally coal
Fuel capacity	Total: 6,450 US gal (24,400 L); Usable: 6,100 US gal (23,000 L)
Water cap.	25,000 US gal (95,000 L)
Sandbox cap.	8,000 lb (3,629 kg)
Fuel consumption	20–25 US gal (76–95 L) of fuel oil per mile; 200 US gal (760 L) of water 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 ; 14,000 US gal / hour capacity
Heating surface	5,889 sq ft (547 m2)
• Tubes	967 sq ft (90 m2)
• Flues	4,218 sq ft (392 m2)
• Tubes and flues	5,185 sq ft (482 m2)
• Firebox	704 sq ft (65 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 in (6 mm)
Train heating	Steam heat
Loco brake	Pneumatic, Schedule 8-ET
Train brakes	Pneumatic
Safety systems	Cab signals, PTC

Type and origin
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

Union Pacific "Big Boy" 4014
Union Pacific "Big Boy" 4014
	Union Pacific Big Boy No. 4014 idles in Pine Bluffs, Wyoming, during a servicing stop on July 3, 2023
Power type
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
Configuration:;
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: 72 ft 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: 132 ft 9+7⁄8 in (40.48 m);
Width	11 ft (3.35 m)
Height	16 ft 2+1⁄2 in (4.94 m)
Axle load	67,500 lb (30,617 kg)
Adhesive weight	540,000 lb (244,940 kg)
Loco weight	762,000 lb (345,637 kg)
Tender weight	436,500 lb (197,993 kg)
Total weight	1,198,500 lb (543,630 kg)
Tender type	25-C
Fuel type	No. 5 fuel oil, originally coal
Fuel capacity	Total: 6,450 US gal (24,400 L); Usable: 6,100 US gal (23,000 L)
Water cap.	25,000 US gal (95,000 L)
Sandbox cap.	8,000 lb (3,629 kg)
Fuel consumption	20–25 US gal (76–95 L) of fuel oil per mile; 200 US gal (760 L) of water 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 ; 14,000 US gal / hour capacity
Heating surface	5,889 sq ft (547 m2)
• Tubes	967 sq ft (90 m2)
• Flues	4,218 sq ft (392 m2)
• Tubes and flues	5,185 sq ft (482 m2)
• Firebox	704 sq ft (65 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 in (6 mm)
Train heating	Steam heat
Loco brake	Pneumatic, Schedule 8-ET
Train brakes	Pneumatic
Safety systems	Cab signals, PTC
Maximum speed
Performance figures
Maximum speed	80 mph (130 km/h)
Power output	6,290 hp (4,690 kW) @ tender drawbar
Tractive effort	138,240 lbf (614.9 kN)
Factor of adh.	3.91
Operators
Career
Operators	Union Pacific
Class	4884-1
Number in class	15
Numbers	UP 4014;
Nicknames	"The Big Boy"
Locale	Western United States
Delivered	December 1941
First run	December 1941 (revenue service); May 2019 (excursion service)
Last run	July 21, 1959
Retired	December 7, 1961
Restored	May 1, 2019
Current owner	Union Pacific; (Union Pacific Heritage Fleet)
Disposition	Operational
	References:

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. 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.

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