2-4-0+0-4-2

UIC class1B+B1, 1’B+B1’

UIC class1B+B1, 1’B+B1’

French class120+021

Turkish class23+23

2-4-0+0-4-2

Equivalent classifications UIC class 1B+B1, 1’B+B1’ French class 120+021 Turkish class 23+23 Swiss class 2/3+2/3, 4/6 from the 1920s Russian class 1-2-0+0-2-1

First known tank engine version First use 1915 Country Brazil Locomotive Q class Railway São Paulo Railway Designer Beyer, Peacock and Company Builder Beyer, Peacock and Company Evolved from 0-4-0+0-4-0

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 2-4-0+0-4-2 is an articulated locomotive, usually of the Garratt type. The wheel arrangement is effectively two 2-4-0 locomotives operating back to back, with the boiler and cab suspended between the two power units. Each power unit has two leading wheels on one axle, four powered and coupled driving wheels on two axles and no trailing wheels. A similar wheel arrangement exists for Mallet locomotives, but is referred to as 2-4-4-2 since only the front engine unit can pivot.