The WAGR A/AA/AB classes are classes of diesel locomotives built by Clyde Engineering, Granville, New South Wales, Australia, for the Western Australian Government Railways (WAGR) between 1960 and 1969.

Six were assembled under contract by Commonwealth Engineering at Bassendean becoming the first diesel locomotives built in Western Australia.

[4] All were built at Granville and fitted with more powerful Electro Motive Diesel 12-645E engines.

[8][9] Those remaining with Westrail were included in the sale of the business to Australian Railroad Group in October 2000.

When the business was split in June 2006, A1513 and A1514 were transferred to Aurizon with the South Australian operations and were reclassified as the 1200 class[10] while A1501 and the remaining four ABs passed to QR National with the Western Australian operations, and were renumbered AB1501-AB1504.