The Union Pacific had three classes called Northen FEF (Four Eight Four)
FEF-1 # 800-819 1937, ALCO builder
FEF-2 # 820-834 1939, ALCO builder
FEF-3 # 835-844 1945, ALCO builder, same class as FEF-2 but built after war with substitutions of materials due to the war.
These locomotives were originally intended primarily to passenger service with speed up to 100 m/h cruising speed and have even reached
110 m/h but were overcome by diesel locomotives and were then used as
locomotives for freight trains . The locomotive numbered 844 (ex #8444)
was retained and is sometimes used to "excursion" train.
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