Union Pacific 844

Union Pacific 844
Union Pacific No. 844 running through Painted Rocks, Nevada on September 15, 2009
Type and origin References:[1] Power type Steam Builder American Locomotive Company (ALCO) Serial number 72791 Build date December 24, 1944 Rebuild date 1959–1960
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: ​  • Firebox 442 sq ft (41.1 m2)  • Tubes 2,204 sq ft (204.8 m2)  • Flues 1,579 sq ft (146.7 m2)  • Total surface 4,225 sq ft (392.5 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) Valve gear Walschaerts
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
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.^[2] Today, it is one of UP's oldest serving locomotives^[3] and the only steam locomotive never retired by a North American Class I railroad.^[4]