Midland, string of AQHY with CSA sulphuric acid tanks, originally built by the WAGR Midland Workshops in 1964/66 as a WF type flat waggon, then in 1997, following several recodes and modifications, seventy five waggons converted to the WQH type to carry CSA sulphuric acid tanks between Hampton/Kalgoorlie and Perth/Kwinana.