The M.R.W.A. originally coded its ballast wagons "H". There seem to have been a substantial number of these judging by the number of the only recorded survivor (29H) which, by 1911 had become IA270. This wagon has disappeared by 1927. The H code was later used for the horseboxes. I suspect that this group of wagons was inherited from the contractor who built the line (Edward Keane). It may have included wagons from a number of sources including ex W.A.G.R. stock. It is possible that I 283-289 were classified IA at one point in the 1920's.

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