WOB type iron ore waggon WOB 31378 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 303 for Koolyanobbing iron ore operations., seen here at Bonnie Vale loaded with fines, 28th May 2006.