UP class FEF
| UP class FEF | |
|---|---|
 No. 844 at Kosse, Texas in April 2010
|
|
| Numbering: | FEF-1 800-819 FEF-2: 820-834 FEF-3: 835-844 |
| Number: | 45 |
| Manufacturer: | ALCO |
| Year of construction (s): | 1937, 1939, 1944 |
| Retirement: | around 1960 (except No. 844) |
| Type : | 2'D2 'h2 |
| Gauge : | 1435 mm ( standard gauge ) |
| Fixed wheelbase: | 6,706 mm |
| Total wheelbase: | 17,577 mm |
| Service mass: | FEF-1: 210.0 t FEF2 / 3: 219.1 t |
| Service mass with tender: | FEF-1: 376.5 t FEF-2/3: 411.9 t |
| Friction mass: | FEF-1: 122.5 t FEF-2/3: 120.9 t |
| Driving wheel diameter: | FEF-1: 1,956 mm FEF-2/3: 2,032 mm |
| Control type : | Walschaerts |
| Cylinder diameter: | FEF-1: 622 mm FEF-2/3: 635 mm |
| Piston stroke: | 813 mm |
| Boiler overpressure: | 20.7 bar |
| Grate area: | 9.3 m² |
| Radiant heating surface: | 41.4 m² |
| Tubular heating surface: | 351.4 m² |
| Superheater area : | 130.0 m² |
The vehicles of the class FEF of the Union Pacific Railroad (UP), also known as class 800 , are steam locomotives with the wheel arrangement 2'D2 '( Northern ). With a total of 45 locomotives, a distinction is made between three delivery series or subclasses FEF-1, FEF-2 and FEF-3, with the FEF-2 and -3 differing from the FEF-1 in terms of the coupling wheel and cylinder diameter.
The last locomotive of this series, No. 844, was the last steam locomotive built for the UP. It was never retired and is still operational by the UP to this day.
history
In the late 1930s, the train loads in passenger train operations became so great that the class 7000 2'D1 locomotives reached their limits. After the collapse of such a locomotive, on whose train the UP President's company car was also part of the train, ALCO received the order to build a more powerful locomotive that could pull passenger cars at 90 mph (145 km / h) on level 20.
The first 20 locomotives were delivered in 1937. They were given the numbers 800-819 and the designation FEF, which stood for "four-eight-four" (the 4-8-4 wheel arrangement in Whyte notation ). They had a coupling wheel diameter of 77 inches (1956 mm). The first coupled wheel set could be moved sideways so that the necessary cornering ability was still given despite a fixed wheelbase of 6.7 m. Despite the size of the locomotives, there were only two cylinders, as was almost invariably the case in the United States.
The locomotives performed excellently, and in 1939 ALCO delivered another 15 locomotives with the numbers 820-834, which were designated as Class FEF-2. They had coupling wheels enlarged to 80 inches (2032 mm) and a larger cylinder diameter so that the pulling force remained about the same. The six-axle Tender was a seven-"Centipede" - Tender replaced, in which the rear five sets of wheels were firmly supported in the frame.
The ten locomotives delivered in 1944 (No. 835-844), which were designated as FEF-3, differed practically only in the materials used from the FEF-2.
After the Second World War , all FEF were converted to oil firing. Because the passenger trains were increasingly driven by diesel locomotives, the locomotives were last used in freight train service. They were retired between 1957 and 1962, only the youngest of them, the FEF-3 No. 844, was kept in service for special trains. Between 1962 and 1989 it was numbered 8444 because 844 was intended for a class of diesel locomotives in the numbering plan.
844 is the only steam locomotive in a Class I railroad that has not been retired to this day. It is used regularly on special trips across the United States, and it is still approved for speeds of up to 79 mph (127 km / h).
Preserved copies
One FEF-1, one FEF-2 and two FEF-3 have been preserved:
- # 814 is at the RailsWest Railroad Museum in Council Bluffs, Iowa.
- # 833 is in the Utah State Railroad Museum in Ogden .
- No. 838 serves as a spare parts dispenser for No. 844.
- No. 844 is operational and stationed at the UP depot in Cheyenne, Wyoming .
gallery
No. 844 in May 2006
Front view
Boxpok coupling wheels
Towing frame
literature
- George H. Drury: Guide to North American Steam Locomotives . 1st edition. Kalmbach Publishing Co., Waukesha, WI 1993, ISBN 0-89024-206-2 .
Web links
Individual evidence
- ↑ a b TrainWeb - Prototype Oriented Articles - Union Pacific 844
- ↑ Railswest Museum picture gallery
- ↑ Picture gallery of No. 833
- ↑ a b Union Pacific 838 and 5511 ( Memento of the original from July 29, 2009 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
