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. 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. 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. Seen here with the body top lip also fitted.