MRWA G class

{{Short description|Class of Australian diesel-electric locomotives}}

{{more footnotes needed|date=January 2015}}

{{Use dmy dates|date=May 2022}}

{{Infobox locomotive

|name = Midland Railway of Western Australia G class

|powertype = Diesel-electric

|image = G51 Northcliffe, 1986(3).JPG

|alt =

|caption = G51 at Northcliffe in July 1986

|builder = English Electric, Rocklea

|ordernumber =

|serialnumber =

|buildmodel =

|builddate = 1963

|totalproduction = 2

|rebuilder =

|rebuilddate =

|numberrebuilt =

|aarwheels = C-C

|uicclass = Co-Co

|gauge = {{track gauge|1067mm|lk=on}}

|trucks =

|bogies =

|wheeldiameter = {{convert|3|ft|1+1/2|in|m|3|abbr=on}}

|trailingdiameter =

|minimumcurve = {{convert|250|ft|m|3|abbr=on}}

|wheelbase = {{convert|32|ft|m|3|abbr=on}} total, {{convert|11|ft|6|in|m|3|abbr=on}} bogie

|length = {{convert|41|ft|m|3|abbr=on}} over headstocks

|width = {{convert|8|ft|11|in|m|3|abbr=on}}

|height = {{convert|12|ft|7|in|m|3|abbr=on}}

|axleload = {{convert|12+1/2|LT|t ST|1|}}

|weightondrivers =

|locoweight = {{convert|75|LT|t ST|1|}}

|fueltype = Diesel

|fuelcap = {{convert|700|impgal|gal L|abbr=on}}

|lubecap =

|coolantcap =

|watercap =

|sandcap =

|powersupply =

|consumption =

|watercons =

|primemover = English Electric 8SVT Mk II

|rpmrange = 450–850 rpm

|enginetype = Four-stroke, four valves per cylinder

|aspiration = turbocharged

|displacement =

|alternator =

|generator = EE819/7E

|tractionmotors = Six EE548A

|headendpower =

|cylindercount = 8 Vee

|cylindersize = {{convert|10|x|12|in|mm|0|abbr=on}}

|transmission =

|multipleworking = 110V, stepless electro-pneumatic throttle

|maxspeed = {{convert|55|mph}}

|poweroutput = {{convert|1030|hp|kW|-1|abbr=on}} gross, {{convert|950|hp|kW|-1|abbr=on}} net

|tractiveeffort = {{convert|43000|lbf|kN|1|abbr=on}} at {{convert|5.9|mph|kph|-1|abbr=on}}

|factorofadhesion =

|trainheating =

|locobrakes = straight air

|locobrakeforce =

|trainbrakes = vacuum

|safety =

|operator = Midland Railway of Western Australia

|operatorclass =

|powerclass =

|numinclass = 2

|fleetnumbers = G50-G51

|officialname =

|nicknames =

|axleloadclass =

|locale =

|deliverydate =

|firstrundate = 7 May 1963

|lastrundate =

|retiredate =

|withdrawndate =

|preservedunits = G50

|restoredate =

|scrapdate =

|currentowner =

|disposition = 1 preserved, 1 scrapped}}

The G class were a class of diesel locomotives built by English Electric, Rocklea for the Midland Railway of Western Australia in 1963. They were later sold to the Western Australian Government Railways.