2-10-2

First known tank engine version
First known tank engine version
First use	1922
Country	Germany
Locomotive	Prussian T 20
Railway	Deutsche Reichsbahn
Designer	Prussian state railways
Builder	Borsig & Hanomag

Equivalent classifications
Equivalent classifications
UIC class	1E1, 1′E1′
French class	151
Turkish class	57
Swiss class	5/7
Russian class	1-5-1

2-10-2 (Santa Fe)
	ATSF tandem compound 2-10-2
UIC class
Equivalent classifications
UIC class	1E1, 1′E1′
French class	151
Turkish class	57
Swiss class	5/7
Russian class	1-5-1
First use
First known tank engine version
First use	1922
Country	Germany
Locomotive	Prussian T 20
Railway	Deutsche Reichsbahn
Designer	Prussian state railways
Builder	Borsig & Hanomag
First use
First known tender engine version
First use	1903
Country	United States
Locomotive	AT&SF 900 class
Railway	Atchison, Topeka and Santa Fe
Builder	Atchison, Topeka and Santa Fe
Evolved from	2-10-0, 2-8-2
Evolved to	2-10-4
Benefits	Deeper firebox and better steaming than the 2-10-0
Drawbacks	Nosing action at speed
First use
First known "True type" version
First use	1919
Country	United States
Locomotive	AT&SF 3800 class
Railway	Atchison, Topeka and Santa Fe
Builder	Atchison, Topeka and Santa Fe
Evolved to	2-10-4
Benefits	Larger and deeper firebox
Drawbacks	Nosing action at speed

Under the Whyte notation for the classification of steam locomotives, 2-10-2 represents the wheel arrangement of two leading wheels, ten powered and coupled driving wheels, and two trailing wheels. In the United States and elsewhere the 2-10-2 is known as the Santa Fe type, after the Atchison, Topeka and Santa Fe Railway that first used the type in 1903.