2-10-2

2-10-2 (Santa Fe)

ATSF tandem compound 2-10-2

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

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 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 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.