WO type iron ore waggon WO 31230 is one of a batch of sixty two built by Goninan WA between April and August 2000 with serial number 950086-004 and fleet number 122 for Koolyanobbing iron ore operations, and is a Goninan built replacement WO type waggon that replaces the original WAGR built WO type waggon with the newer style WOD type and has square features opposed to the curved ones as on the original WO class, on loaded train 7415 at Binduli Triangle, 31st July 2010.