UP 844
.jpg)
UP 844 at Painted Rocks, Nevada, on September 15, 2009
|
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||||||||||||
| Type and origin | |
|---|---|
| Power type | Steam |
| Builder | American Locomotive Company |
| Serial number | 72791 |
| Build date | December 1944 |
| Specifications | |
|---|---|
| Configuration | 4-8-4 |
| UIC class | 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) |
| Adhesive weight | 266,490 lb (120,878 kg; 121 t) |
| Loco weight | 486,340 lb (220,600 kg; 221 t) |
| Tender weight | 421,550 lb (191,212 kg; 191 t) |
| Total weight | 907,890 lb (411,812 kg; 412 t) |
| Fuel type | No. 5 fuel oil, originally coal |
| Fuel capacity | 6,200 US gal (23,000 l; 5,200 imp gal) |
| Water cap | 23,500 US gal (89,000 l; 19,600 imp gal) |
| Firebox: • Firegrate area |
100 sq ft (9.3 m2) (grate removed in 1945) |
| Boiler | 86 3⁄16 in (2189.2 mm) diameter |
| Boiler pressure | 300 lbf/in2 (2.07 MPa) |
| Heating surface | 4,224 sq ft (392.4 m2) |
| • Tubes | 2,204 sq ft (204.8 m2) |
| • Flues | 1,578 sq ft (146.6 m2) |
| • Firebox | 442 sq ft (41.1 m2) |
| Superheater: |
|
| • Heating area | 1,400 sq ft (130 m2) |
| Cylinders | Two |
| Cylinder size | 25 in × 32 in (635 mm × 813 mm) |
| Performance figures | |
|---|---|
| Maximum speed | 120 mph (190 km/h) |
| Power output | 4,500 hp (3,400 kW) |
| Tractive effort | 63,800 lbf (283.8 kN) |
| Factor of adh. | 4.18 |
| Career | |
|---|---|
| Operators | Union Pacific Railroad |
| Class | FEF-3 |
| Numbers | 844 (8444 from 1962-1989) |
| Disposition | Operational, based on Cheyenne, Wyoming, in roundhouse |
Union Pacific 844 is a 4-8-4 "Northern" type steam locomotive built by the American Locomotive Company in December 1944 for the Union Pacific Railroad. Constructed as a member of the FEF-3 class of 4-8-4's, the 844 was the last steam locomotive delivered to Union Pacific. Though the FEF-3 class was originally built for high-speed passenger work, 844 and the rest of the FEF-3 class were pressed into a variety of dual-service work. While commercial Union Pacific steam operations ended in the late 1950s, the 844 was retained by the railroad for special activities. Today, it is one of UP's oldest serving locomotives and is the only steam locomotive never retired by a North American Class I railroad.
No. 844 was one of ten locomotives that were ordered by Union Pacific in 1944 and designated as class FEF-3. The FEF-3 class represented the epitome of dual-service steam locomotive development; funds and research were being concentrated into the development of diesel-electric locomotives. Designed to burn coal, they were converted to run on fuel oil. Like the earlier FEF-2 class, FEF-3 locomotives were designed as passenger engines. They pulled such trains as the Overland Limited, Los Angeles Limited, Portland Rose and Challenger.
From 1957 to 1959, UP 844 was reassigned to freight service in Nebraska when diesel-electric locomotives took over passenger service.
Saved from scrapping in 1960, 844 was chosen for restoration and is now used on company and public excursion trains, along with revenue freight during ferry moves.
Built and designed in a joint effort between the Union Pacific and ALCO, the 844 and the rest of the FEF-3 class could safely handle 120 mph. On one occasion, one of the engines of the FEF-3 class pulled a 1,000-ton passenger train at 100 mph. All FEF classes were considered by the Union Pacific to be capable of producing between 4,000 and 5,000 drawbar horsepower.
...
Wikipedia