| Class 5100 | |
| Powertype: | Steam |
| Leadingdiameter: | 813mm |
| Driverdiameter: | 1.372m (04.501feet) |
| Wheelbase: | 5.435m (17.831feet) |
| Hatnote: | Reference:[1] |
| Whytetype: | 4-4-0 |
| Length: | 13.115m (43.028feet) |
| Locoweight: | 26 t |
| Builder: | Kitson and Company |
| Builddate: | 1874 |
| Totalproduction: | 4 |
| Rebuilder: | Kobe |
| Rebuilddate: | 1876 |
| Numberrebuilt: | 2 |
| Boilerpressure: | 9.5kg/cm2 |
| Firearea: | 1.10NaN0 |
| Totalsurface: | 75.90NaN0 |
| Cylindercount: | Two |
| Cylindersize: | 35.6x |
The 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.[2]