2-4-0

First known tender engine version
First known tender engine version
First use	c. 1830s-1840s
Country	United Kingdom
Evolved from	2-2-0 & 2-2-2
Benefits	Better adhesion with coupled wheels

Equivalent classifications
Equivalent classifications
UIC class	1B, 1'B
French class	120
Turkish class	23
Swiss class	2/3
Russian class	1-2-0

2-4-0 (Porter)
	Front of locomotive at left
	LSWR 0298 Class or Beattie Well Tank
UIC class
Equivalent classifications
UIC class	1B, 1'B
French class	120
Turkish class	23
Swiss class	2/3
Russian class	1-2-0
First use
First known tender engine version
First use	c. 1830s-1840s
Country	United Kingdom
Evolved from	2-2-0 & 2-2-2
Benefits	Better adhesion with coupled wheels

Under the Whyte notation for the classification of steam locomotives, 2-4-0 represents the wheel arrangement of two leading wheels on one axle, four powered and coupled driving wheels on two axles and no trailing wheels. In most of North America it became known as a Porter.

The notation 2-4-0T indicates a tank locomotive of this wheel arrangement, on which its water and fuel is carried on board the engine itself, rather than in an attached tender.

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