Editing 2-10-2 (section)

{{Short description|Locomotive wheel arrangement}}
{{Infobox steam wheel arrangement
| name             = 2-10-2 (Santa Fe)
| image            = WheelArrangement 2-10-2.svg
| alt              = Diagram of one small leading wheel, five large driving wheels joined together with a coupling rod, and one small trailing wheel
| caption          = 
| image2           = 2-10-2 tandem compound locomotive, Santa Fe (Howden, Boys' Book of Locomotives, 1907).jpg
| alt2             = 
| caption2         = ATSF tandem compound 2-10-2
<!--Equivalent classifications-->
| hatnote          = 
| UIC/Germany/Italy= 1E1, 1′E1′
| French/Spanish   = 151
| Turkish          = 57
| Swiss            = 5/7
| Russian          = 1-5-1
<!--First known tank engine version-->
| date             = 1922
| country          = Germany
| locomotive       = [[Prussian T 20]]
| railway          = [[Deutsche Reichsbahn]]
| designer         = [[Prussian state railways]]
| builder          = [[Borsig]] & [[Hanomag]]
| evolvedfrom      = 
| evolvedto        = 
| mainbenefit      = 
| maindrawback     = 
<!--First known tender engine version-->
| date2            = 1903
| country2         = United States 
| locomotive2      = AT&SF 900 class
| railway2         = [[Atchison, Topeka and Santa Fe Railway|Atchison, Topeka and Santa Fe]]
| designer2        = 
| builder2         = Atchison, Topeka and Santa Fe
| evolvedfrom2     = [[2-10-0]], [[2-8-2]]
| evolvedto2       = [[2-10-4]]
| mainbenefit2     = Deeper firebox and better steaming than the [[2-10-0]]
| maindrawback2    = Nosing action at speed
<!--First known "True type" version-->
| date3            = 1919
| country3         = United States 
| locomotive3      = AT&SF 3800 class
| railway3         = Atchison, Topeka and Santa Fe
| designer3        = 
| builder3         = Atchison, Topeka and Santa Fe
| evolvedfrom3     = 
| evolvedto3       = [[2-10-4]]
| mainbenefit3     = Larger and deeper firebox
| maindrawback3    = Nosing action at speed
}}

Under the [[Whyte notation]] for the classification of [[steam locomotive]]s, '''{{nowrap|2-10-2}}''' represents the [[wheel arrangement]] of two [[leading wheel]]s, ten powered and coupled [[driving wheel]]s, and two [[trailing wheel]]s. In the United States and elsewhere the {{nowrap|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.