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WO type iron ore waggon WO 31212 is one of a batch of eighty six built by WAGR Midland Workshops between 1967 and March 1968 with fleet number 108 for Koolyanobbing iron ore operations, with a 75 ton and 1018 ft³ capacity, empty train arriving at Binduli Triangle, 31st July 2010. This unit was converted to WOS superphosphate in the late 1980s till 1994 when it was re-classed back to WO.