The FEF series consisted of three classes of steam locomotives: FEF-1, FEF-2, and FEF-3. Converted to oil fuel in 1945–1946. No. 844 in excursion service since 1960; renumbered to 8444 from 1962 to 1989. The first 20 locomotives, numbered 800–819, were …

These were designated Class FEF-1 and were designed by UP's Motive Power Group to have 77" drivers, 24.5 x 32 cylinders, a boiler pressure of 300 psi, and a weight of 465,000 lbs resulting in a tractive effort of 63,611 pounds (63,800 nominal).

The Union Pacific FEF-1 is the first batch of the FEF Series (FEF meaning, "four-eight-four") which consisted of twenty 4-8-4 "Northern" steam locomotive types built by the American Locomotive Company (ALCO) in 1937 for the Union Pacific Railroad (UP).

Jan 20, 2025 · These got the Class FEF-1 and were designed mostly by UP's Motive Power Group to have 77" drivers, 24.5"x32" cylinders, an operating boiler pressure of 300 PSI, and a weight of 465,000 pounds resulting in a tractive effort of 63,611 pounds.

Union Pacific No. 814 Is A FEF-1 Class Steam Locomotive built In 1937 By ALCO In Schenectady, New York. It was part of the first class of FEF locomotives built for the Union Pacific Railroad. The locomotive was ordered as a result of issues with the previous 4 …

FEF-3 class, UP Steam Program.

The Union Pacific Northern Under the Whyte notation for the classification of steam locomotives, 4-8-4 represents the wheel arrangement of four leading wheels on two axles, eight powered and coupled driving wheels on four axles and four trailing wheels on two axles.

The first 20 class FEF-1 locomotives were delivered by ALCO in 1938 and had 77 inch diameter drivers. Rolling resistance was reduced with roller bearings on all axles and tapered connecting rods ensured that the moving masses were reduced.

Union Pacific Railroad FEF-1 800 at Cheyenne, Wyoming on October 24, 1957, Kodachrome by Dick Rumbolz, Chuck Zeiler collection.

Fitting Alco's lateral motion devices to the leading coupled wheels eased the negotiation of curves. Complicated accessories often spoilt the basic simplicity of so many US locomotives, but UP resisted most of them, resulting in an elegant, uncluttered appearance.