WOD type iron ore waggon WOD 31300 is one of a batch of sixty two built by Goninan WA between April and August 2000 with serial number 950086-011 and fleet number 501 for Koolyanobbing iron ore operations with a 75 ton capacity and a replacement for a WO type waggon number, for Portman Mining to cart their Koolyanobbing iron ore to Esperance, Binduli, 29th July 2010.