The 59 class is an old class of steam locomotive built by Baldwin-Lima-Hamilton Corporation for the New South Wales Government Railways of Australia.
The class were ordered from Baldwin-Lima-Hamilton (the former Baldwin Locomotive Works) to relieve motive power shortages. The design is a variation on the USATC S200 Class Mikado engine, a design which first appeared in 1941. Twenty locomotives entered service between August 1952 and March 1953. The most immediately apparent difference is the rather stubby short tender that was specially built to allow the 59 class to be turned on a standard 60-foot (18.29 m) turntable. It was the specification of these tenders which considerably delayed the delivery from the initial order. Unfortunately due to the weight of the locomotive it was eventually discovered, in service, that most 60-foot (18.29 m) turntables could not turn the 59 class engine due to balancing issues.