BHP Port Kembla D1 class

The D1 class were a class of diesel locomotives built by Commonwealth Engineering, Granville for Australian Iron & Steel's, Port Kembla steelworks in 1950-1951.

History
In May 1950 D1 became the first diesel to operate on an Australian main line. The eight D class locomotives hauled trains on Australian Iron & Steel's, Port Kembla until a downturn in the early 1980s saw most of the class withdrawn. D6 and D7 were reactivated with the former remaining in service until 2004.

Three have been preserved:
 * D1 by the New South Wales Rail Transport Museum, Thirlmere
 * D6 by the Lithgow State Mine Heritage Park & Railway, Lithgow. This unit is still stored in Port Kembla
 * D7 by the former ARHS ACT Division, Canberra.