The 48 Class is a class of diesel locomotives built by AE Goodwin, Auburn for the New South Wales Department of Railways between 1959 and 1970. Once the most ubiquitous locomotive in New South Wales, Australia, it is based on Alco frames and prime movers, using General Electric electrical equipment. The South Australian Railways 830 and Silverton Rail 48s classes are of a very similar design.

AE Goodwin was an Australian heavy engineering firm, which produced railway locomotives and rolling stock, as well as roadmaking machinery at its factory in Auburn.