The WMX class were double deck car carrying wagons. A total of thirty were built in two series. Ten were built in 1969 with another ten by Comeng NSW in 1970. After a gap of 5 years another ten were built in 1975.

1969	WMX 34001 - 34010 built
1970	WMX 34011 - 34020 built
1975	WMX 34021 - 34030 built

With the loading gauge no obstacle and the light weight of the load, conversion to a triple deck car carrier was an obvious improvement. WMX 34039 was the prototype conversion and became class WMB in 1977. From 1979 the WMX were reclassified to bring them into line with the ROA standards and became WMFX. This was complete by 1983.

1976	WMX 34014 written off
1977	WMX 34029 to WMB
1979	WMX 34005, 34020, 34023, 34024, 34027 to WMFX
1980	WMX 34001, 34002, 34007, 34008, 34009, 34010, 34011, 34012, 34015, 34017, 34022, 34025, 34026 to WMFX
1981	WMX 34003, 34004, 34006, 34013, 34018, 34021, 34028 to WMFX
1982	WMX 34016, 34030 to WMFX
1983	WMX 34019 to WMFX

After the success of the conversion of 34029 more were required. The vehicles selected for the conversion were the remaining second series WMFX wagons which became class WMGF. All nine wagons (34021- 34028, 34030) were converted in 1989. 34029 was brought into line as a WMGF in 1993.

WMX Series 1 Diagram

WMX Series 2 Diagram