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WO type iron ore waggon WO 31213 is one of a batch of eighty six built by WAGR Midland Workshops between 1967 and March 1968 with fleet number 109 for Koolyanobbing iron ore operations, with a 75 ton and 1018 ft³ capacity, on empty train 6418 at Binduli Triangle, 31st July 2010. This unit was converted to WOG for gypsum in late 1980s till 1990 then reclassed to WOS for superphosphate before being re-classed back to WO in 1994.