In the early 1960's sand traffic commenced between Koala Siding, Lang Lang and the Spotswood Glass factory. The sand was transported in covered hopper wagons converted from _O__ and _ON_ wagons with the original numbers retained.
The hopper interiors were specially coated to stop the sand from contamination.
With the demise of four wheel wagons in the late 1970's, early 1980's, the traffic was retained with the use of JSX_ bogie sand hoppers.