The Lancaster Wagon Co built ten sheep trucks for the M.R.W.A. in 1891 numbered 1D-10D. However, well before 1911 four of these were missing (1, 7, 9 and 10). It is possible that they were converted to another type (class G tankers for example) or sold. The G.S.R. also had four sheep wagons that became WAGR C4382-4385, which are similar if not identical. They could well be the missing wagons. The remaining six wagons were converted or reclassified as class DA before 1911 and renumbered DA233-238. The D classification was re-used for bogie cattle wagons after about 1902. In 1913 another four wagons were built numbered 326-331.

This photo at left of a sheep wagon at Mingenew is likely to be an original MRWA D class. The GSR ones were identical, but because this is at Mingenew it is almost certainly an MRWA example. (RHWA photo collection). The diagram below is the WAGR diagram for the GSR sheep trucks.

It is known that this class were rebuilt at some point in their careers with new bodies but when is not known. It may coincide with reclassification to DA but this is not certain. In 1932 the twelve wagons were renumbered 601-612. They were written off in 1953-1955 and replaced by new DXB class wagons carrying the same numbers.