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WOB type iron ore waggon WOB 31392 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 317 for Koolyanobbing iron ore operations, then the top section re-fitted and converted to a WSM ballast hopper, then converted back to a WOB by WAGR Midland Workshops. It was originally numbered 31391 by WAGR, seen here loaded with fines at Bonnie Vale, 28th May 2006.