Reclassing: D1, D2 and D4 Class
In 1922 a complex renumbering and reclassing of VR locomotives saw the Dd class split into two subclasses, the D1 class (comprising all the original saturated steam locomotives with 18 in. cylinders) and the D2 class (comprising superheated locomotives with either 18 or 19 in. cylinders).
With the introduction of a further D3 class in 1929, the Dde tank locomotives were reclassified as D4 class in 1929.
Read more about this topic: Victorian Railways Dd Class, History
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