| Powertype: | Steam |
| Builder: | Beyer, Peacock & Co. |
| Serialnumber: | 6905–6910, 6970–6975 |
| Builddate: | 1939, 1940 |
| Totalproduction: | 12 |
| Whytetype: | (Garratt) |
| Uicclass: | (2′D2′)(2′D2′) h4 |
| Driverdiameter: | 4feet |
| Width: | 9feet |
| Height: | 12inchesft5.5inchesin (ftin) |
| Fueltype: | Coal |
| Watercap: | 6000impgal |
| Firearea: | 48.5sigfig=3NaNsigfig=3 |
| Tubearea: | 1963square feet |
| Fireboxarea: | 169square feet |
| Totalsurface: | 2561square feet |
| Superheatertype: | Inside |
| Superheaterarea: | 429square feet |
| Cylindercount: | 4 (Garratt) |
| Cylindersize: | 16x |
| Valvegear: | Walschaerts |
| Valvetype: | Trunk type |
| Valvetravel: | 5inches |
| Tractiveeffort: | 472002NaN2 |
| Locobrakes: | Westinghouse type |
| Trainbrakes: | Westinghouse type |
| Safety: | 3 Ross muffled pop valves |
| Numinclass: | 12 |
| Firstrundate: | 1939 |
| Withdrawndate: | 1967 |
| Preservedunits: | KUR 87 (EAR 5711) |
| Disposition: | One preserved, remainder scrapped |
The KUR EC3 class, later known as the EAR 57 class, was a class of gauge Garratt-type articulated steam locomotives. The twelve members of the class were built by Beyer, Peacock & Co. in Manchester, England, for the Kenya-Uganda Railway (KUR). They entered service between 1939 and 1941, and were later operated by the KUR's successor, the East African Railways (EAR).
The numbers, build dates and names of each member of the class were as follows:
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