2-8-2

2-8-2 (Mikado)

USRA Light Mikado No. 639 from the Nickel Plate Road

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

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 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

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,^[1] frequently shortened to Mike.^[2]

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.^[3]

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.