In 1958 the Commonwealth Railways of Australia and the Electricity Trust of Southern Australia (ETSA) took delivery of a total of seven shunting locomotives, built by Clyde Engineering of Granville, NSW. These three axle rigid frame locomotves were fitted with a Maybach MD325 turbocharged straight-6 engine rated at 545hp for traction [620hp gross], driving into a Mekydro K104U transmission. The six that CR had were largely sidelined by 1971. The sole CR survivor was loaned to ETSA for a period and is now preserved.
For slightly more information follow the link on the Australian Locopage site:
http://locopage.railpage.org.au/anr/mdh.html
Originally this link had no photograph. It now has a picture of the surviving member of the class (MDH1) in it's ETSA guise, when it was numbered as ETSA No.2.
August 2003
On the Australian National Railway Museum website, there is a picture and some history of ETSA No.1, which is also preserved and in very good condition too.