4-2-4T

First known tank engine version
First known tank engine version
First use	1853
Country	United Kingdom
Locomotive	Pearson 4-2-4T
Railway	Bristol and Exeter Railway
Designer	James Pearson
Builder	Bristol and Exeter Railway

Equivalent classifications
Equivalent classifications
UIC class	2A2
French class	212
Turkish class	15
Swiss class	1/5
Russian class	2-1-2

4-2-4
	Pearson 4-2-4T no. 44 of the Bristol and Exeter Railway, c. 1854
UIC class
Equivalent classifications
UIC class	2A2
French class	212
Turkish class	15
Swiss class	1/5
Russian class	2-1-2
First use
First known tank engine version
First use	1853
Country	United Kingdom
Locomotive	Pearson 4-2-4T
Railway	Bristol and Exeter Railway
Designer	James Pearson
Builder	Bristol and Exeter Railway

Under the Whyte notation for the classification of steam locomotives, 4-2-4 represents the wheel arrangement of four leading wheels on two axles, two powered driving wheels on one axle, and four trailing wheels on two axles.

The configuration was only used for tank engines, which is noted by adding letter suffixes to the configuration, such as 4-2-4T for a conventional side-tank locomotive, 4-2-4ST for a saddle-tank locomotive, 4-2-4WT for a well-tank locomotive and 4-2-4RT for a rack-equipped tank locomotive.