In 1964 the WAGR acquired 50 Ballast hoppers from Commonwealth Railways. These had originally been built as BAS class hopper wagons by Westralia Ironworks and Gray Brothers for the CR in 1915/6.

1915	BAS 567, 568, 569, 572, 574, 575, 576, 579,581, 586, 587, 588, 589, 590, 591, 594, 597, 599 built by Gray brothers.for CR
1916	BAS 508, 510, 511, 513, 515, 517, 519, 522, 523, 526, 527, 529, 530, 531, 532, 533, 534, 535, 538, 540, 541, 543, 545, 546, 548, 549, 550, 553, 558, 561, 562, 563,built by Westralia ironworks for CR
1964	BAS 508, 510, 511, 513, 515, 517, 519, 522, 523, 526, 527, 529, 530, 531, 532, 533, 534, 535, 538, 540, 541, 543, 545, 546, 548, 549, 550, 553, 558, 561, 562, 563, 567, 568, 569, 572, 574, 575, 576, 579,581, 586, 587, 588, 589, 590, 591, 594, 597, 599 sold to WAGR as WSJ 30551-30600
The last wagon to come into service was 30570 which was the only one to come into service in 1965.

https://www.westonlangford.com/media/photos/107581.jpg

They were intended for a 10 year life and within a very short time 3 of them had been written off. Disposals were as follows:

1965	30551, 30558, 30575 written off
1969	30585 written off
1974	30552, 30554-30557, 30559-30562, 30564-30572, 30574, 30576, 30577, 30580-30584, 30586, 30588-30591, 30593, 30594, 30596-30600 written off and sold by Commonwealth Govt.
1979	30573, 30592 written off
1984	30553, 30563, 30578, 30579, 30587, 30595 written off

WSJ Diagram