4-10-2

First known tank engine version
First known tank engine version
First use	1899
Country	Colony of Natal
Locomotive	NGR Class C
Railway	Natal Government Railways
Designer	George William Reid
Builder	Dübs and Company
Evolved from	4-8-2T

Equivalent classifications
Equivalent classifications
UIC class	2'E1'
French class	251
Turkish class	58
Swiss class	5/8
Russian class	2-5-1

4-10-2 (Reid Ten wheeler/Overland/Southern Pacific)
	Front of locomotive at left
	NGR Class C Reid Tenwheeler 4-10-2T no. 171
UIC class
Equivalent classifications
UIC class	2'E1'
French class	251
Turkish class	58
Swiss class	5/8
Russian class	2-5-1
First use
First known tank engine version
First use	1899
Country	Colony of Natal
Locomotive	NGR Class C
Railway	Natal Government Railways
Designer	George William Reid
Builder	Dübs and Company
Evolved from	4-8-2T
First use
First known tender engine version
First use	1925
Country	United States of America
Locomotive	SP-2 class
Railway	Southern Pacific Railroad
Designer	American Locomotive Company
Builder	American Locomotive Company
Evolved from	2-10-2
Benefits	Could handle roughly 20% more tonnage than the 2-10-2 while using around 16% less fuel than the 2-10-2.
Drawbacks	Complex to maintain because of the third cylinder

Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 4-10-2 represents the arrangement of four leading wheels, ten powered and coupled driving wheels and two trailing wheels. In South Africa, where the wheel arrangement was first used, the type was known as a Reid Tenwheeler. In the United States of America it was known as a Southern Pacific on the Southern Pacific Railroad and as an Overland on the Union Pacific Railroad.

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