2-8-2

First known tank engine version
First known tank engine version
First use	1884
Country	Australia
Locomotive	8D15 class
Railway	Queensland Railways
Builder	Dübs & Co.
Evolved from	2-8-0
Evolved to	2-8-4
Benefits	Larger coal bunker.

Equivalent classifications
Equivalent classifications
UIC class	1D1, 1'D1'
French class	141
Turkish class	46
Swiss class	4/6
Russian class	1-4-1

2-8-2 (Mikado)
	USRA Light Mikado No. 639 from the Nickel Plate Road
UIC class
Equivalent classifications
UIC class	1D1, 1'D1'
French class	141
Turkish class	46
Swiss class	4/6
Russian class	1-4-1
First use
First known tank engine version
First use	1884
Country	Australia
Locomotive	8D15 class
Railway	Queensland Railways
Builder	Dübs & Co.
Evolved from	2-8-0
Evolved to	2-8-4
Benefits	Larger coal bunker.
First use
First known tender engine version
First use	1884
Country	United States of America
Locomotive	Calumet
Railway	Chicago & Calumet Terminal Railway
Evolved from	2-8-0, 2-6-2
Evolved to	2-8-4, 2-10-2
Benefits	Larger firebox aft of drivers
First use
First known "True type" version
First use	1867
Country	United States
Locomotive	No. 82 Bee
Railway	Lehigh Valley
Designer	Alexander Mitchell
Builder	Norris Locomotive Works
Evolved from	2-10-0
Benefits	Better stability on tight curves

Under the Whyte notation for the classification of steam locomotives, 2-8-2 represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, eight powered and coupled driving wheels on four axles and two trailing wheels on one axle, usually in a trailing truck. This configuration of steam locomotive is most often referred to as a Mikado, frequently shortened to Mike.

It was also at times referred to on some railroads in the United States as the McAdoo Mikado and, during World War II, the MacArthur.

The notation 2-8-2T indicates a tank locomotive of this wheel arrangement, the "T" suffix indicating a locomotive on which the water is carried in tanks mounted on the engine rather than in an attached tender.