Union Pacific FEF-1 FEF-2 FEF-3 4-8-4 Northern

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 type was first used by the Northern Pacific Railway, and initially named the Northern Pacific, but rail fans and railroad employees have shortened the name since its introduction. It is most-commonly known as a Northern.

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