[1] A total of 72 G class engines were acquired by the WAGR between 1889 and 1899, both new and second-hand.

[1][2] They were originally designed by Beyer, Peacock & Co who built nine, with James Martin & Co building 29, Neilson & Co 12 and Dubs and Co 22.

[4][5] Three were also sold to the Chillagoe Railway & Mining Co in 1907, while others were sold for further use by timber mill operators in Western Australia, such as Millars, Bunnings Bros, Kauri Timber Co., Goldfields Firewood Supply and the State Saw Mills.

71 "Menzies" (ex-WAGR G 111) was the last G Class withdrawn in 1972, having the mantle of the last steam locomotive in revenue service in Western Australia.

Several have been preserved:[6] Media related to WAGR G class at Wikimedia Commons