4-8-4

First known tender engine version
First known tender engine version
First use	1926
Country	United States
Locomotive	NP class A
Railway	Northern Pacific Railway
Designer	American Locomotive Company
Builder	American Locomotive Company
Evolved from	4-8-2, 4-6-4
Benefits	Deeper firebox than the 4-8-2.

Equivalent classifications
Equivalent classifications
UIC class	2′D2′
French class	242
Turkish class	48
Swiss class	4/8
Russian class	2-4-2

4-8-4 (Northern)
	Santa Fe No. 3751
UIC class
Equivalent classifications
UIC class	2′D2′
French class	242
Turkish class	48
Swiss class	4/8
Russian class	2-4-2
First use
First known tender engine version
First use	1926
Country	United States
Locomotive	NP class A
Railway	Northern Pacific Railway
Designer	American Locomotive Company
Builder	American Locomotive Company
Evolved from	4-8-2, 4-6-4
Benefits	Deeper firebox than the 4-8-2.

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 railfans and railroad employees have shortened the name since its introduction. It is most-commonly known as a Northern.

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