English Electric spent around 20 years from 1956 in Australia as a locomotive manufacturer, being a subsidiary of the parent company in the UK. The UK firm had earlier built around 80 locos for Australian operators, while EE (Australia) built some 280 locos. Some other locos were built by government railways using EE engines etc. English Electric had just one factory, at Rocklea (Brisbane). Around 1970, the company changed its name to the General Electric Company of Australia (not to be confused with the American GE).
 

Model Number	Locomotive Class/Classes
MCH139C	Q:1250
M153C	W:C
M153CX	Q:1270
M195C	W:K; BHP Port Hedland: A; BHP Port Kembla: D46; SCT:K, South Spur Rail:K
M195CX	Q:1300; T:ZC; PacNatQld:MKA
M195CX1	W:R, South Spur Rail:R
M195CX2	W:RA/KA; SCT:KA, South Spur Rail:KA
ML202C	T:Z
ML255C	Q:2350; T:ZB, South Spur Rail:ZB
ML255CX	T:ZA
RSE75A	W:F; Coote Industrial Rail:F
RSE92C	Q:1600
RS95C	Q:1620
RSE110C	W:G
SE37B	BHP Port Kembla: D9/D20
STE73B	A:800
STE83B	BHP Port Kembla:D16/D26
ST95B	W:H; BHP Port Hedland:B; SCT:H
STE101B	BHP Port Kembla:D35
STE195C	BHP Port Kembla:D34

This list of model numbers came from the November 1974 edition of Railway Transportation magazine.
 

Model Number	Description
A	A1A-A1A
B	Bo-Bo
C	Co-Co
CH	Cab/Hood ?
E	End-cab ?
L	Low-hood ?
M	Mainline ?
RS	Road-switcher ?
S	Shunter ?
T	Transfer ?
X	Differentiator ?
X1	Differentiator ?
X2	Differentiator ?
37	402 HP Engine ?
73	885 HP Engine ?
75	780 HP Engine ?
83	850 HP Engine ?
92	838 HP Engine ?
95	950 HP Engine ?
101	1012 HP Engine ?
110	1030 HP Engine ?
139	1535 HP Engine ?
153	1535 HP Engine ?
195	1950 HP Engine ?
202	2025 HP Engine ?
255	2350 HP Engine ?

Thanks to Steve Palmano for helping out with definitions.

If you can fill in the gaps in the model number definitions, please e-mail me.

I also earlier came across a more limited alternative list of model numbers, as follows:
 
 

Model Number	Locomotive Class/Classes
DE615A1A	W:F
DE660B	A:800
DE838C	Q:1600
DE950C	W:G
DE1388C	Q:1250, W:C
60T	BHP Port Kembla: D9/D20
88T	BHP Port Kembla:D16/D26

 
 

Model Number	Description
615	730 HP engine?
660	660 HP engine?
838	838 HP engine?
950	1030 HP engine?
1388	1535 HP engine?
A1A	A1A-A1A bogies
B	Bo-Bo bogies
C	Co-Co bogies
DE	Diesel-electric (mainline)?
60	61 ton mass?
88	93 ton mass?
T	Tons (mass)?

NOTE: For "Locomotive Classes", the following abbreviations apply:

• A = SAR/AN/ASR
• T = TasRail/ATN
• W = Westrail
• Q = QR

Builder's Numbers