D Class 4-4-0 From NSWGR No in class 6 Entered Service 1913 (built 1880 as “Q” class)
G Class 2-8-0 No in class 26 Entered Service 1914 – 1917
K Class 2-8-0 No in class 8 Entered Service 1916 (built in Glasgow, Scotland)
KA Class 2-8-0 No in class 26 Entered Service 1919 – 1920
F Class 2-6-0 From NSWGR No in class 1 Entered Service 1915 (built 1885 in the USA)
The G Class were manufactured in Philadelphia USA (12), Clyde in Granville NSW (4) and the Toowoomba Foundry Company, Queensland (10).
The KA Class were built in Maryborough, Queensland (20) and Gawler, South Australia (6).
The Commonwealth Railways tended to model their locomotives on designs from other systems, namely the NSWGR , when it came to standard gauge steam locomotives.
The next class, the C Class, were not introduced until 1938.
Sources: Riders of the Steel Highways – Monte Luke
Locomotives and Railcars of the Commonwealth Railways – NRM Adelaide