Union Pacific Class FEF-2

The Union Pacific FEF-2 is the second batch of the FEF Series (FEF meaning, "four-eight-four") which consisted of fifteen 4-8-4 "Northern" steam locomotive types built by the American Locomotive Company (ALCO) in 1939 for the Union Pacific Railroad (UP). They were assigned road numbers 820 through 834.
== Origins ==
During the late 1930s, the rising trainloads started to exceed the limits of the 4-8-2 that were the mainstay of the UP passenger operations. One day, in 1937, with UP President William Jeffer's business car in the rear, a "7000" Class 4-8-2 demonstrated the lack of steaming power inherent in the type. Even when the train was waiting for rescue, a telegram was sent to ALCO in Schenectady seeking something better. The result was a superb class of 45 locomotives known as the FEF Series that could run at 100 mph and produce between 4,000 and 5,000 drawbar horsepower. They also ran about 14,000 miles a month.
The first twenty locomotives were delivered by ALCO in 1937 and were classified as the FEF-1 with the later 25 being classified as the FEF-2 and FEF-3. The "800"s, as they were sometimes known, as a whole followed the simplest possible arrangement of only having two outside cylinders. Fitting ALCO's lateral motion devices to the leading coupled wheels eased the negotiation of curves. Complicated accessories often spoiled the basic simplicity of so many US locomotives, but UP resisted most of them, resulting in an elegant, uncluttered appearance. Despite frequently moving at speeds over 100 mph (161 km/h), the forces and stresses on the coupling and connecting rods were kept within acceptable limits. There were thus excellent results, and there were many reports of the class reaching the design limit of 110 mph (177 km/h).
The second batch of fifteen was delivered in 1939. These had several improvements, including larger cylinders, better tractive effort, smoke deflectors on the sides of the smokebox, and the driving wheel diameter was increased by three inches. The greatest change, however, was the provision of a fourteen wheeled "pedestal" or "centipede" tender, in place of the twelve wheeled ones of the first twenty locomotives.
== Preservation ==
Of the 15 that were built only one locomotive, No. 833, survives. Currently it is on static display at the Utah State Railroad Museum in Ogden, Utah.
== Stock list ==
Loco No.	Image	Build date(s)	Retirement Date(s)	Status 	Notes
820 	 	1939 	 	Scrapped 	
821 	 	1939 	 	Scrapped 	
822 	 	1939 	 	Scrapped 	
823 	 	1939 	 	Scrapped 	
824 	 	1939 	 	Scrapped 	
825 	 	1939 	 	Scrapped 	
826 	 	1939 	 	Scrapped 	
827 	 	1939 	 	Scrapped 	
828 	 	1939 	 	Scrapped 	
829 	 	1939 	 	Scrapped 	
830 	 	1939 	 	Scrapped 	
831 	 	1939 	 	Scrapped 	
832 	 	October 1939 	July 1962 	Scrapped 	
833 	 	October 1939 	1957 	Currently on static display at the Utah State Railroad Museum in Ogden, Utah.	
834 	 	1939 	 	Scrapped 	
== Gallery ==
File:Defaultup832.jpeg
File:G54zuwxkdls21.webp
Category:American locomotives
Category:American steam locomotives
Category:Steam locomotives
Category:Sole survivor
Category:Union Pacific locomotives
Category:Built in 1939
Category:Locomotives
Category:Tender locomotives
Category:Standard gauge locomotives
Category:Standard gauge locomotives of the United States
Category:4-8-4 locomotives
Category:4-8-4 steam locomotives
Category:Union Pacific FEF Series
Category:Eight-coupled locomotives
Category:ALCO locomotives