Union Pacific 844

Specifications
Specifications
Configuration:;
• Whyte	4-8-4
• UIC	2′D2′ h2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	80 in (2,032 mm)
Wheelbase	Loco & tender: 98 ft 5 in (30.00 m)
Length	114 ft 2+5⁄8 in (34.81 m)
Width	11 ft 1+1⁄8 in (3.38 m)
Height	15 ft 2 in (4.62 m)
Axle load	66,622.5 lb (30,219.5 kg)
Adhesive weight	266,490 lb (120,878 kg)
Loco weight	486,340 lb (220,600 kg)
Tender weight	421,550 lb (191,212 kg)
Total weight	907,890 lb (411,812 kg)
Fuel type	No. 5 fuel oil, originally coal
Fuel capacity	6,200 US gal (23,000 L)
Water cap.	23,500 US gal (89,000 L)
Fuel consumption	15–25 US gal (57–95 L) of fuel oil per mile ; 100–200 US gal (380–760 L) of water per mile
Firebox:
• Grate area	100.2 sq ft (9.31 m2) (grate removed in 1945)
Boiler	86 3⁄16 in (2189.2 mm) diameter ; 100 in (2,540 mm) (OD)
Boiler pressure	300 lbf/in2 (2.07 MPa)
Heating surface	4,225 sq ft (392.5 m2)
• Tubes	2,204 sq ft (204.8 m2)
• Flues	1,579 sq ft (146.7 m2)
• Firebox	442 sq ft (41.1 m2)
Superheater:;
• Type	Type A
• Heating area	1,400 sq ft (130 m2)
Cylinders	Two, outside
Cylinder size	25 in × 32 in (635 mm × 813 mm)

Type and origin
Type and origin
	References:
Power type	Steam
Builder	American Locomotive Company (ALCO)
Serial number	72791
Build date	December 24, 1944
Rebuild date	1959–1960

Union Pacific 844
Union Pacific 844
	Union Pacific No. 844 running through Painted Rocks, Nevada on September 15, 2009
Power type
Type and origin
	References:
Power type	Steam
Builder	American Locomotive Company (ALCO)
Serial number	72791
Build date	December 24, 1944
Rebuild date	1959–1960
Configuration:;
Specifications
Configuration:;
• Whyte	4-8-4
• UIC	2′D2′ h2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	80 in (2,032 mm)
Wheelbase	Loco & tender: 98 ft 5 in (30.00 m)
Length	114 ft 2+5⁄8 in (34.81 m)
Width	11 ft 1+1⁄8 in (3.38 m)
Height	15 ft 2 in (4.62 m)
Axle load	66,622.5 lb (30,219.5 kg)
Adhesive weight	266,490 lb (120,878 kg)
Loco weight	486,340 lb (220,600 kg)
Tender weight	421,550 lb (191,212 kg)
Total weight	907,890 lb (411,812 kg)
Fuel type	No. 5 fuel oil, originally coal
Fuel capacity	6,200 US gal (23,000 L)
Water cap.	23,500 US gal (89,000 L)
Fuel consumption	15–25 US gal (57–95 L) of fuel oil per mile ; 100–200 US gal (380–760 L) of water per mile
Firebox:
• Grate area	100.2 sq ft (9.31 m2) (grate removed in 1945)
Boiler	86 3⁄16 in (2189.2 mm) diameter ; 100 in (2,540 mm) (OD)
Boiler pressure	300 lbf/in2 (2.07 MPa)
Heating surface	4,225 sq ft (392.5 m2)
• Tubes	2,204 sq ft (204.8 m2)
• Flues	1,579 sq ft (146.7 m2)
• Firebox	442 sq ft (41.1 m2)
Superheater:;
• Type	Type A
• Heating area	1,400 sq ft (130 m2)
Cylinders	Two, outside
Cylinder size	25 in × 32 in (635 mm × 813 mm)
Maximum speed
Performance figures
Maximum speed	120 mph (190 km/h)
Power output	4,850 hp (3,620 kW)
Tractive effort	63,800 lbf (283.8 kN)
Factor of adh.	4.18
Operators
Career
Operators	Union Pacific Railroad
Class	FEF-3
Numbers	UP 844; UP 8444;
Nicknames	"The Living Legend"
Delivered	December 1944
First run	December 1944 (revenue service); 1960 (excursion service)
Last run	1959 (revenue service)
Restored	1960 (rebuilt, but never retired)
Current owner	Union Pacific Railroad (Union Pacific heritage fleet)
Disposition	Stored in operational condition

Union Pacific 844 is a class "FEF-3" 4-8-4 "Northern" type steam locomotive owned and operated by the Union Pacific Railroad for its heritage fleet. Built in December 1944 by the American Locomotive Company (ALCO) of Schenectady, New York, No. 844 is one of four surviving FEF series locomotives and the only one in operation.

The locomotive operated in revenue service until 1959. It was stored while awaiting scrapping, along with the rest of the UP steam locomotive fleet. In 1960, railroad leaders recognized the benefits of having a steam program and retained No. 844 for special activities, the kernel of what has become the Union Pacific's heritage fleet. Today, it is one of UP's oldest serving locomotives and the only steam locomotive never retired by a North American Class I railroad.

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