JGR Class 5100

{{short description|Japanese steam locomotive type}}

{{Infobox locomotive

| name= Class 5100

| powertype= Steam

| gauge= {{RailGauge|1067mm|lk=on}}

| leadingdiameter = {{convert|813|mm|ftin|abbr=on}}

| driverdiameter = {{Convert|1.372|m|ftin|abbr=on}}

| trailingdiameter=

| wheelbase = {{convert|5.435|m|ftin|abbr=on}}

| image= JGR-5100SL.jpg

| caption= Locomotive No. 18 before being classified Class 5100

| hatnote = Reference:Naotaka Hirota Steam Locomotives of Japan (1972) Kodansha International Ltd. pp.90&103 {{ISBN|0-87011-185-X}}

| whytetype= 4-4-0

| designer=

| retiredate=

| disposition=

| length= {{Convert|13.115|m|ftin|abbr=on}}

| locoweight= 26 t

| locotenderweight=

| fueltype =

| fuelcap =

| watercap =

| builder= Kitson and Company

| builddate= 1874

| totalproduction = 4

| rebuilder = Kobe

| rebuilddate = 1876

| numberrebuilt = 2

| maxspeed =

| boilerpressure = {{convert|9.5|kg/cm2|lb/in2|abbr=on}}

| firearea = {{convert|1.1|m2|sqft|0|abbr=on}}

| tubearea =

| fluearea =

| tubesandflues =

| fireboxarea =

| totalsurface = {{convert|75.9|m2|sqft|0|abbr=on}}

| superheatertype =

| superheaterarea =

| cylindercount = Two

| cylindersize = {{convert|35.6|x|50.8|cm|in|0|abbr=on}}

| valvegear =

| tractiveeffort=

}}

The {{Nihongo|JGR Class 5100|5100形}} was a type of 4-4-0 steam locomotive used on Japanese Government Railways. The two locomotives, numbered 18 and 20, were built by Kitson and Company in the United Kingdom in 1874 as 0-6-0 locomotives of the later JGR Class 7010. They were rebuilt into 4-4-0 wheel arrangement passenger locomotives at Kobe in 1876. In 1909, the two locomotives were classified Class 5100, becoming numbers 5100 and 5101.{{cite book |first=Koichi |last = Inoue |title= Illustrated Steam Locomotives of National Railways |publisher = JTB Publishing | year = 2014|location = Japan |language = Japanese |pages = 19, 151|isbn = 9784533098628}}