Commonwealth Railways KA class

{{Short description|Class of Australian 2-8-0 locomotives}}

{{Use Australian English|date=May 2014}}

{{Use dmy dates|date=May 2014}}

{{Infobox locomotive

| name = Commonwealth Railways KA class

| powertype = Steam

| image = KA class, Commonwealth Railways, ca 1951.jpg

| alt = A KA class locomotive, c 1951.

| caption = A KA class locomotive, c 1951.

| designer =

| builder = Perry Engineering (6)
Walkers Limited (20)

| ordernumber =

| serialnumber =

| buildmodel =

| builddate = 1918-1920

| totalproduction = 26

| rebuilder =

| rebuilddate =

| numberrebuilt =

| whytetype = {{whyte|2-8-0}}

| uicclass =

| gauge = {{track gauge|1435 mm|allk=on}}

| leadingdiameter =

| driverdiameter =

| trailingdiameter =

| minimumcurve =

| wheelbase =

| length =

| width =

| height =

| axleload =

| weightondrivers =

| locoweight =

| tenderweight =

| locotenderweight =

| tendertype =

| fueltype = Coal

| fuelcap =

| watercap = {{convert|4,850|impgal|L USgal|abbr=on}}

| tendercap =

| sandcap =

| boiler =

| boilerpressure =

| feedwaterheater =

| firearea =

| tubearea =

| fluearea =

| tubesandflues =

| fireboxarea =

| totalsurface =

| superheatertype =

| superheaterarea =

| cylindercount =

| cylindersize = {{convert|22|x|26|in|mm|0|abbr=on}}

| frontcylindersize=

| rearcylindersize =

| hpcylindersize =

| lpcylindersize =

| valvegear =

| valvetype =

| valvetravel =

| valvelap =

| valvelead =

| transmission =

| maxspeed =

| poweroutput =

| tractiveeffort = {{convert|29,609|lbf|kN|abbr=on}}

| factorofadhesion =

| trainheating =

| locobrakes =

| locobrakeforce =

| trainbrakes =

| safety =

| operator = Commonwealth Railways

| operatorclass =

| powerclass =

| numinclass =

| fleetnumbers = KA35–KA54, KA56–KA61

| officialname =

| nicknames =

| axleloadclass =

| locale =

| deliverydate =

| firstrundate = September 1918

| lastrundate =

| retiredate =

| withdrawndate =

| preservedunits =

| restoredate =

| scrapdate =

| currentowner =

| disposition = All scrapped}}

The Commonwealth Railways KA class was a class of {{whyte|2-8-0}} tender locomotives of the Commonwealth Railways, Australia. The class operated on the {{track gauge|sg}} Trans-Australian Railway.