In 1904 two new H class wagons (1069 and 1070) were built on the GB type 15'-0" wooden chassis. A further fourteen (141, 1063, 1064, 1075, 1077, 1891, 1894, 1897, 1898, 1899, 2079, 4248, 4249, 4253) followed in 1905. In 1905 all of these wagons were reclassified HA. The WAGR outline diagram is shown below.	No picture available

In 1917, two standard H class wagons, 3042 and 3130, were reclassified HA. It is unclear whether these were completely new wagons to HA standard with wooden underframes or NZR frames with wider HA width bodies. A further example (3899) was produced in 1929. HA3899 was written off and became JETTY 77 in 1950, followed by 3042 in 1956 and 3130 in 1972. In 1932 a group of L class ballast wagons at Port Hedland (8824-8831, 8833-8835) were converted to class HA. Again the chassis type is unclear. Number 8833 was then rebuilt as a class G in 1933-4. In 1943 J8832 was also converted at Port Hedland to class HA. All of these HA class wagons were transferred to the Public works department in 1951 when the Port Hedland line closed. Finally in 1964 two M.R.W.A. M class wagons (M341 and 342) were reclassified HA by the W.A.G.R. and renumbered 40761 and 40762. They had originally been intended for carrying motor vehicles. These two wagons, although of the same width as the standard HA, were 17'-0" long over headstocks. They were written off in 1966 (40762) and 1967 (40761).