WOB type iron ore waggon WOB 31380 is one of a batch of twenty five built by Comeng WA between 1974 and 1975 and converted from Mt Newman high sided waggons by WAGR Midland Workshops with a capacity of 67 tons with fleet number 305 for Koolyanobbing iron ore operations on a loaded train at Binduli, 30th May 2007.