The WAGR moved on from the WF flat top to the WFX quickly. In late 1969 the first of the new class appeared. They were long enough at 63' to take three 20' ISO containers whereas the WF at 54' long could not. They were also lighter but could not take as great a load. This first batch built in 1969-70 was of 161 wagons. In 1970 twenty-one of these new wagons were put on narrow gauge bogies and reclassified QWF. The were reconverted to standard gauge in 1972-3. In December 1973 construction of another batch started numbered 30201-30245. They were completed in 1974 to bring the class total to 206.

1969	WFX 30301 - 30309, 30311 - 30312 built
1970	WFX 30310, 30313 - 30461 built WFX 30335 - 30355 to QWF
1972	QWF 30335-30337, 30339-30342, 30344-30351, 30353-30355 to WFX
1973	QWF 30338, 30343, 30352 to WFX WFX 30202 built
1974	WFX 30201, 30203-30245 built

WAGR official photo of WFX (RHWA collection)

In 1979 reclassification to WQCX started. WQC was a temporary classification applied to 18 wagons in 1980-2 but by the end of 1982 they were all WQCX.

1979	WFX 30240, 30347, 30402, 30433, 30209, 30223, 30245, 30336, 30367, 30412, 30421, 30210, 30216, 30239, 30335, 30361, 30417, 30429, 30440, 30201, 30206, 30244, 30302, 30320, 30322, 30407, 30426, 30453, 30214, 30219, 30228, 30317, 30327, 30331, 30332, 30422, 30218, 30306, 30343, 30372, 30386, 30444, 30225, 30324, 30339, 30340, 30368, 30408, 30229, 30342, 30382, 30384, 30304, 30313, 30348, 30352, 30358, 30374, 30397, 30398, 30432, 30439 to WQCX
1980	WFX 30202, 30203, 30204, 30207, 30208, 30211, 30213, 30215, 30217, 30220, 30221, 30222, 30224, 30226, 30230, 30231, 30232, 30234, 30235, 30236, 30238, 30241, 30242, 30243, 30301, 30303, 30305, 30307, 30308, 30309, 30310, 30311, 30312, 30314, 30316, 30319, 30321, 30323, 30325, 30326, 30328, 30330, 30333, 30334, 30337, 30338, 30344, 30345, 30346, 30349, 30350, 30351, 30353, 30354, 30355, 30356, 30357, 30359, 30360, 30362, 30363, 30364, 30365, 30366, 30369, 30370, 30371, 30373, 30375, 30376, 30377, 30378, 30379, 30380, 30381, 30383, 30385, 30387, 30388, 30389, 30390, 30391, 30392, 30393, 30394, 30395, 30396, 30399, 30400, 30401, 30403, 30404, 30405, 30406, 30409, 30410, 30413, 30414, 30415, 30416, 30419, 30420, 30423, 30424, 30425, 30427, 30428, 30430, 30431, 30434, 30435, 30437, 30438, 30441, 30442, 30443, 30445, 30447, 30448, 30449, 30450, 30451, 30452, 30454, 30455, 30456, 30457, 30458, 30459, 30460 to WQCX WQCX 30222, 30302, 30305, 30309, 30346, 30354, 30361, 30375, 30381, 30391, 30403, 30407, 30419, 30420, 30426, 30429, 30430, 30443 to WQC
1981	WFX 30227, 30461, 30212, 30318, 30446, 30329, 30205, 30233, 30411, 30418, 30436, 30237, 30315, 30341 to WQCX WQC 30305, 30309, 30354, 30361, 30391, 30403, 30407, 30430, 30443 to WQCX
1981/2	WQC 30222, 30302, 30346, 30375, 30381, 30419, 30420, 30426, 30429, to WQCX
1986	WQCX 30373 to WSP

WAGR official photo of WQCX 30450 (RHWA collection)

After a relatively uncomplicated life up to this point, the 1990s saw a number of conversions and reclassifications for the WQCX's which I have probably not discovered the full extent of. At the end of it at least 76 of the class were now class WQTY.

1992	WQCX 30321, 30381 written off
1993	WQCX 30235 to WQCW WQCX 30360, 30416, 30382, 30303, 30411 to WFCS
1994	WQCX 30401 written off WQCX 30301, 30302, 30304, 30305, 30306, 30307, 30309, 30310, 30311, 30312, 30313, 30314, 30315, 30316, 30317, 30318, 30319, 30320, 30323, 30324, 30326, 30327, 30329, 30330, 30331, 30332, 30333, 30334 to RQHX
1995	WQCX 30345, 30396, 30402, 30408, 30410, 30412, 30413, 30418, 30430 to WQA WQCX 30442, 30444 to WQO container flat
1996	WQCX 30308, 30325, 30337, 30341, 30347, 30349, 30351, 30352, 30357, 30358, 30361, 30364, 30368, 30369, 30370, 30371, 30374, 30375, 30376, 30378, 30379, 30380, 30385, 30386, 30387, 30392, 30393, 30394, 30395, 30397, 30398, 30399, 30400, 30401, 30404, 30407, 30408, 30409, 30417, 30419, 30420, 30421, 30427 to WQTY WQA 30396, 30402, 30412, 30413, 30418, 30430 to WQTY RQHX 30301, 30302, 30304, 30305, 30306, 30307, 30309, 30310, 30311, 30312, 30313, 30314, 30315, 30316, 30317, 30318, 30319, 30320, 30323, 30324, 30326, 30327, 30329, 30330, 30331, 30332, 30333, 30334 to WQTY
By 2010 there were 136 wagons left, classified as follows:
AFAF	30405, 30449, 30454, 30456, 30457, 30459, 30460, 30461
AQCY	30208, 30219, 30234, 30242, 30243, 30318, 30321, 30324, 30337, 30344, 30347, 30353, 30364, 30368, 30374, 30385, 30394, 30409, 30413, 30419, 30430, 30432, 30445, 30458
AQFY	30202, 30209, 30240, 30328, 30338, 30339, 30345, 30367, 30422, 30423, 30424, 30425, 30426, 30429, 30433, 30434, 30439, 30440, 30441, 30443, 30448, 30451, 30452
AQWY	30201, 30203, 30204, 30205, 30206, 30211, 30212, 30213, 30214, 30215, 30216, 30222, 30224, 30226, 30227, 30228, 30230, 30231, 30232, 30233, 30235, 30236, 30239, 30241, 30244, 30245, 30308, 30312, 30323, 30329, 30335, 30336, 30343, 30346, 30348, 30351, 30354, 30359, 30362, 30363, 30365, 30366, 30377, 30384, 30388, 30389, 30390, 30392, 30402, 30408, 30412, 30415, 30431, 30435, 30437, 30438, 30442, 30444, 30446, 30450, 30453, 30455
AZWY	30373 (clearly still a departmental wagon)
WFCS	30303, 30360, 30382, 30411, 30416 (i.e this small fleet was still intact)
WQCY	30207, 30340, 30356
WQTY	30302, 30304, 30309, 30311, 30314, 30315, 30319, 30320, 30332, 30399

WFX Diagram