Just had a read up on these DT's in Lane's book. (I had forgotten how dreadfull the book it).
It notes that they were 3 shaft (despite the engine illustrated 11455 obviously having 4), and that they were fitted with ''roller type sloping firebox door'', presumably the smokebox. These errors are obviously from the author not knowing what he is looking at.
It also goes on to say that the later the ''boiler, engine unit and back axle would be imported from england'' the rest made locally by Schmidt & Muller, Ironfounders in Sydney. Despite the errors above, you would have thought this statement had some basis in fact. The reference is to a Steaming article.
What do the erection sheets/order book for these engines say?, presumably they reference a drawing number for the parts made and supplied, and are silent when the parts were not made?. Presumably by looking at the sheets for the sequence of 70 it would be possible to see when they stopped sending 'tractors' and sent the boiler units etc.
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