"These oil-burning Decapods came out of the Angus shops in four subclasses. They reflected the CP's study of the R2 conversions and were very similar in size and power.
"R3a (2 units in May and June 1917), R3b (1 in August, 3 in September, 1 in January 1918), and R3c (18 units in January to June 1918) all had the same boiler dimensions. The 10 R3d (1 in June, 3 in July, 2 August, and 2 each in January-February 1919) had slightly more firebox area (230 sq ft vs 221).
"The big difference among the sub-classes seems to have been the size of the journal bearings on the driving axle (the 3rd of 5)."
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