Commonwealth Engineering, was awarded a contract in 1966 to construct 20 open wagons. They were classified "GMX" and allocated road numbers 1906 through 1925.
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| 1906 | 1907 | 1908 | 1909 | 1910 | 1911 | 1912 | 1913 | 1914 | 1915 |
| 1916 | 1917 | 1918 | 1919 | 1920 | 1921 | 1922 | 1923 | 1924 | 1925 |
Open wagon constructed by Commonwealth Engineering.
| 9.2.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 15.2.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 7.2.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
| - | Recoded "AOPX". |
Open wagon constructed by Commonwealth Engineering.
| 13.2.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 3.2.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 2.2.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 25.1.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 27.1.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 27.1.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 25.1.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
| - | Recoded "AOPX". |
Open wagon constructed by Commonwealth Engineering.
| 28.1.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
| - | Recoded "AOPX". |
Open wagon constructed by Commonwealth Engineering.
| 1.2.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
| - | To "AZMX" for use as bogie transfer wagon. |
Open wagon constructed by Commonwealth Engineering.
| 20.1.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
| - | Recoded "AOPX". |
Open wagon constructed by Commonwealth Engineering.
| 15.3.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 17.3.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
| - | Recoded "AOPX". |
Open wagon constructed by Commonwealth Engineering.
| 10.3.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
| 5.6.1993 | Written off. |
Open wagon constructed by Commonwealth Engineering.
| 14.3.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
Open wagon constructed by Commonwealth Engineering.
| 16.3.1967 | Entered service as "GMX" open wagon. |
| - | Recoded "AOMX". |
| - | Recoded "AOPX". |