2-8-2

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.

2-8-2 (Mikado)
USRA Light Mikado No. 639 from the Nickel Plate Road
Equivalent classifications
UIC class1D1, 1'D1'
French class141
Turkish class46
Swiss class4/6
Russian class1-4-1
First known tank engine version
First use1898
CountryUnited States of America
LocomotiveAlamogordo and Sacramento Mountain Railway #101
RailwayAlamogordo and Sacramento Mountain Railway
BuilderBaldwin Locomotive Works
Evolved from2-8-0
Evolved to2-8-4
BenefitsLarger coal bunker.
First known tender engine version
First use1884
CountryUnited States of America
LocomotiveCalumet
RailwayChicago & Calumet Terminal Railway
Evolved from2-8-0, 2-6-2
Evolved to2-8-4, 2-10-2
BenefitsLarger firebox aft of drivers

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.

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