KUR EC3 class

{{Infobox locomotive

| name = {{ubl|Kenya-Uganda Railway EC3 class|East African Railways 57 class}}

| powertype = Steam

| image = Basil Roberts (690104 EAR).jpg

| alt = No. 5712 Kigezi with a freight train at Mombasa, Kenya, in 1969

| caption = No. 5712 Kigezi with a freight train at Mombasa, Kenya, in 1969

| designer = {{ubl|Beyer, Peacock & Co.|K.C. Strahan|H.B. Stoyle}}

| builder = Beyer, Peacock & Co.

| ordernumber =

| serialnumber = 6905–6910, 6970–6975

| buildmodel =

| builddate = 1939, 1940

| totalproduction = 12

| whytetype = {{whyte|4-8-4+4-8-4}} (Garratt)

| uicclass = (2′D2′)(2′D2′) h4

| gauge = {{RailGauge|1000mm|lk=on}}

| leadingdiameter =

| driverdiameter = {{convert|4|ft|6|in|mm|0|abbr=on}}

| trailingdiameter =

| minimumcurve =

| wheelbase =

| length =

| width = {{convert|9|ft|6|in|mm|abbr=on}}

| height = {{convert|12|ft|5.5|in|abbr=on}}

| axleload =

| weightondrivers = {{convert|97|LT}}

| locoweight = {{convert|186.2|LT}}

| fueltype = Coal

| fuelcap = {{convert|12|LT}}

| watercap = {{convert|6000|impgal|abbr=on}}

| sandcap =

| boiler =

| boilerpressure = {{ubl|{{convert|220|psi|MPa|2|abbr=on}}|({{convert|225|psi|MPa|2|abbr=on}})}}

| feedwaterheater =

| firearea = {{convert|48.5|sqft|m2|sigfig=3|abbr=on}}

| tubearea =  
{{convert|1963|sqft|m2|abbr=on}}

| fluearea =

| tubesandflues =

| fireboxarea = {{convert|169|sqft|m2|abbr=on}}

| totalsurface = {{convert|2561|sqft|m2|abbr=on}}

| superheatertype = Inside

| superheaterarea = {{convert|429|sqft|m2|abbr=on}}

| cylindercount = 4 (Garratt)

| cylindersize = {{convert|16|x|26|in|mm|0|abbr=on}}

| valvegear = Walschaerts

| valvetype = Trunk type

| valvetravel = {{convert|5|in|abbr=on}}

| valvelap =

| valvelead =

| transmission =

| maxspeed =

| poweroutput =

| tractiveeffort = {{convert|47200|lbf|kN|2|abbr=on}}

| factorofadhesion =

| trainheating =

| locobrakes = Westinghouse type

| locobrakeforce =

| trainbrakes = Westinghouse type

| safety = 3 Ross muffled pop valves

| operator = {{ubl|Kenya-Uganda Railway (KUR)|→ East African Railways (EAR)}}

| operatorclass = {{ubl|KUR: EC3 class|EAR: 57 class}}

| powerclass =

| numinclass = 12

| fleetnumbers = {{ubl|KUR: 77–88|EAR: 5701–5712}}

| officialname =

| nicknames =

| axleloadclass =

| locale =

| deliverydate =

| firstrundate = 1939

| lastrundate =

| retiredate =

| withdrawndate = 1967

| preservedunits = KUR 87 (EAR 5711)

| restoredate =

| scrapdate =

| currentowner =

| disposition = One preserved, remainder scrapped

| notes =

}}

The KUR EC3 class, later known as the EAR 57 class, was a class of {{Track gauge|1000mm|lk=on}} gauge {{Whyte|4-8-4+4-8-4}} 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).{{sfn|Ramaer|1974|pp=50–52}}