The 27 class were originally built in 1913 by the Hunslet Co. of Leeds, England, as construction engines for the Public Works Department. The 8 engines were taken over by the New South Wales Railways in 1917, and became the G(1204) class.

They are unique in having Walschaert's valve gear driving flat D-slide valves

Between 1929 and 1938 they were given 25 class boilers and obsolete D50 tenders. 2705 is preserved, but the rest were all scrapped by the end of 1966.

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