High Quality Content by WIKIPEDIA articles! The East Greta Coal Company had constructed its railway empire based on a motley group of secondhand and borrowed steam locomotives, which by 1910, was fast becoming insufficient to move the great loads coming from the Greta Seam which ran right through the South Maitland coalfield. Standardised motive power was sought, and a melding of the New South Wales Department of Railways` P(6) 4-6-0 and T(524) 2-8-0 (later C32 and D50 respectively) designs brought about the 10 Class.