2-4-0+0-4-2

First known tank engine version
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

Equivalent classifications
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

2-4-0+0-4-2
UIC class
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 use
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.

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