In 1962 three locomotives were purchased by BHP for use at its new Whyalla Steelworks. Initially used on construction trains until the facility opened in 1964. A further two were delivered in 1965. All were built for use on the standard gauge. In March 1968 a sixth was purchased for use on the narrow-gauge line between Hummock Hill and the blast furnaces.[1]
All six members of this class have been scrapped with DH1 being the last to be scrapped, having been transferred to Australian Southern Railroad when it took over OneSteel's rail operations in 2000.[2]
| Number | Serial number | Into Service | Withdrawn | Scrapped |
| DH1 | 573 | Apr 1962 | – | 2004 |
| DH2 | 574 | Apr 1962 | – | Feb 1994 |
| DH3 | 575 | May 1962 | – | Oct 1997 |
| DH4 | 579 | Aug 1965 | – | Sep 1997 |
| DH5 | 580 | Sep 1965 | – | Sep 1997 |
| DH6 | 582 | Mar 1968 | – | Sep 1997 |