4-4-2 (locomotive)

First known tank engine version
First known tank engine version
First use	1880
Country	United Kingdom
Locomotive	LT&SR 1 Class
Railway	London, Tilbury and Southend Railway
Designer	William Adams
Builder	Sharp, Stewart & Co. &; Nasmyth, Wilson & Co.
Evolved from	4-4-0T

Equivalent classifications
Equivalent classifications
UIC class	2B1
French class	221
Turkish class	25
Swiss class	2/5
Russian class	2-2-1

4-4-2 (Atlantic)
	Front of locomotive at left
	Milwaukee Road class A2 no. 919, built 1901
UIC class
Equivalent classifications
UIC class	2B1
French class	221
Turkish class	25
Swiss class	2/5
Russian class	2-2-1
First use
First known tank engine version
First use	1880
Country	United Kingdom
Locomotive	LT&SR 1 Class
Railway	London, Tilbury and Southend Railway
Designer	William Adams
Builder	Sharp, Stewart & Co. &; Nasmyth, Wilson & Co.
Evolved from	4-4-0T
First use
First known tender engine version
First use	1888
Country	United States of America
Locomotive	Experimental double-firebox
Designer	George Strong
Builder	Hinkley Locomotive Works
Evolved from	2-4-2
Benefits	More stable than 2-4-2,; Wide & deep firebox

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 4-4-2 represents a configuration of a four-wheeled leading bogie, four powered and coupled driving wheels, and two trailing wheels supporting part of the weight of the boiler and firebox. This allows a larger firebox and boiler than the 4-4-0 configuration.

This wheel arrangement is commonly known as the Atlantic type, although it is also sometimes called a Milwaukee or 4-4-2 Milwaukee, after the Milwaukee Road, which employed it in high speed passenger service.

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