WO type iron ore waggon WO 31405 is one of a batch of eleven replacement waggons built by WAGR Midland Workshops between 1970 and 1971 with fleet number 183 for Koolyanobbing iron ore operations, with a 75 ton and 1018 ft³ capacity, with new wheel sets, on loaded train 6413 at Binduli Triangle, 31st July 2010.