The SXT class consisted of ten wagons converted from TA class bogie cattle wagons and 20 CXB class four wheeled sheep trucks. The frames of the CXB's were used for NF class flat wagons whilst the bodies were donated to the SXT's. The TA bodies were scrapped. The record card shows that the original intent was for them to be coded CXT but this is crossed out and corrected to SXT as being more appropriate for a bogie sheep wagon (C being a 4 wheel class code). The 1960 annual report uses the SXT code.  The converted wagons carried the numbers of the TA's whose frames they were built upon as follows:

1960	23616, 23624, 23634, 23654, 23676, 23684 converted from TA/CXB
1961	23610, 23613, 23642, 23672 converted from TA/CXB

In 1975 two wagons were written off (23616, 23672). Another (23654) followed in 1977. The rest survived until the end of livestock traffic on the W.A.G.R. in 1985. Both 23624 and 23642 were converted to JS class wagons in 1986 and 1987 respectively. The final conversion was 23676 to class QK, in 1988. The remaining wagons (23610, 23613, 23634 and 23684) were written off in 1990.

The WAGR outline diagram is shown below. This diagram was badly drawn - note that the wheels are much closer to the body at the left hand end of the wagon than at the right.  As presented here the body is square but the chassis down to the rails is slightly wedge shaped with the whole thing being taller at the right hand end.