2-10-2

2-10-2 (Santa Fe)
Diagram of one small leading wheel, five large driving wheels joined together with a coupling rod, and one small trailing wheel
ATSF tandem compound 2-10-2
Equivalent classifications
UIC class1E1, 1′E1′
French class151
Turkish class57
Swiss class5/7
Russian class1-5-1
First known tank engine version
First use1922
CountryGermany
LocomotivePrussian T 20
RailwayDeutsche Reichsbahn
DesignerPrussian state railways
BuilderBorsig & Hanomag
First known tender engine version
First use1903
CountryUnited States
LocomotiveAT&SF 900 class
RailwayAtchison, Topeka and Santa Fe
BuilderAtchison, Topeka and Santa Fe
Evolved from2-10-0, 2-8-2
Evolved to2-10-4
BenefitsDeeper firebox and better steaming than the 2-10-0
DrawbacksNosing action at speed
First known "True type" version
First use1919
CountryUnited States
LocomotiveAT&SF 3800 class
RailwayAtchison, Topeka and Santa Fe
BuilderAtchison, Topeka and Santa Fe
Evolved to2-10-4
BenefitsLarger and deeper firebox
DrawbacksNosing 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.