| East African Railways 31 class | |
| Powertype: | Steam |
| Builder: | Vulcan Foundry |
| Serialnumber: | 6228–6273 |
| Builddate: | 1955 |
| Totalproduction: | 46 |
| Uicclass: | 1′D2' h2 |
| Driverdiameter: | 480NaN0 |
| Fueltype: | Oil |
| Fuelcap: | 1667impgal |
| Watercap: | 4108impgal |
| Boilerpressure: | 2002NaN2 |
| Firearea: | 30sigfig=3NaNsigfig=3 |
| Tubearea: | 1511square feet |
| Fireboxarea: | 124square feet |
| Totalsurface: | 1963square feet |
| Superheatertype: | Inside |
| Superheaterarea: | 328square feet |
| Cylindercount: | 2 |
| Cylindersize: | 17x |
| Valvegear: | Walschaerts |
| Tractiveeffort: | 266002NaN2 |
| Locobrakes: | Westinghouse type |
| Trainbrakes: | Westinghouse type |
| Operator: | East African Railways (EAR) |
| Operatorclass: | 31 class |
| Numinclass: | 46 |
| Fleetnumbers: | 3101–3046 |
| Deliverydate: | 1955 |
| Firstrundate: | 1955 |
| Notes: | [1] |
The EAR 31 class was a class of oil-burning gauge steam locomotives. The 46 members of the class were built in 1955 by Vulcan Foundry, in Newton-le-Willows, Lancashire (now part of Merseyside), England, for the East African Railways (EAR). They were a lighter, branch-line version of the EAR 30 class, and worked from various sheds throughout the EAR system.
The numbers and names of each member of the class were as follows:
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