South Australian Railways 900 class

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

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

{{Infobox locomotive

|name = South Australian Railways 900 class

|powertype = Diesel-electric

|image = South Australian Railways 900 class locomotive number 900 at Mile End locomotive depot before transfer to museum.jpg

|alt =

|caption = 900 Lady Norrie

|builder = Islington Railway Workshops

|ordernumber =

|serialnumber =

|buildmodel =

|nicknames = Magnificent Beasts

|builddate = 1951-1953

|totalproduction = 10

|rebuilder =

|rebuilddate =

|numberrebuilt =

|aarwheels =

|uicclass = A1A-A1A

|gauge = {{RailGauge|1600mm|lk=on}}

|trucks =

|bogies =

|wheeldiameter = {{convert|3|ft|6|in|mm|0|abbr=on}}

|trailingdiameter =

|minimumcurve =

|wheelbase = {{convert|52|ft|2|in|mm|0|abbr=on}} total, {{convert|16|ft|2|in|mm|0|abbr=on}} bogie

|length = {{convert|63|ft|4|in|mm|0|abbr=on}} over headstocks, {{convert|66|ft|2|in|mm|0|abbr=on}} over coupling faces

|width = {{convert|9|ft|7+1/4|in|mm|0|abbr=on}}

|height = {{convert|13|ft|9|in|mm|0|abbr=on}}

|axleload = {{convert|21|LT|t ST|1|}}

|weightondrivers = {{convert|84|LT|t ST|1|}}

|locoweight = {{convert|121|LT|t ST|1|}}

|fueltype = Diesel

|fuelcap = {{convert|1000|impgal|L|abbr=on|disp=br()}}

|lubecap =

|coolantcap =

|watercap =

|sandcap =

|powersupply =

|consumption =

|watercons =

|primemover = English Electric 16SVT Mk I

|rpmrange = 450–750 rpm

|enginetype = Four-stroke, 2 valves per cylinder

|aspiration = Turbocharged

|displacement =

|alternator =

|generator = English Electric 822 type

|tractionmotors = 4 type 523A air cooled

|headendpower =

|cylindercount = 16 Vee

|cylindersize = {{convert|10|x|12|in|mm|0|abbr=on|disp=br()}}

|transmission =

|multipleworking = X 3

|maxspeed = {{convert|75|mph}}

|poweroutput = {{convert|1760|hp|kW|-1|abbr=on}} gross, {{convert|1600|hp|kW|-1|abbr=on}} net

|tractiveeffort =

| t/e starting = {{convert|56000|lbf|kN|1|abbr=on}}

| t/e 1 hr =

| t/e continuous = {{convert|34000|lbf|kN|1|abbr=on}} at
{{convert|15|mph|kph|-1|abbr=on}}

|factorofadhesion =

|trainheating =

|locobrakes = Westinghouse Compressed Air, and Electric Dynamic

|locobrakeforce =

|trainbrakes =

|safety =

|operator = South Australian Railways

|operatorclass =

|powerclass =

|numinclass = 10

|fleetnumbers = 900-909

|officialname =

|axleloadclass =

|locale =

|deliverydate =

|firstrundate = 10 September 1951

|lastrundate = 18 June 1985

|retiredate =

|withdrawndate =

|preservedunits = 900, 907, 909

|restoredate =

|scrapdate =

|currentowner =

|disposition = 3 preserved, 7 scrapped}}

The 900 class were a class of diesel locomotives built by Islington Railway Workshops for the South Australian Railways between 1951 and 1953.