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The Cruiser Tank A31 was a Rolls Royce design for a version of the Cromwell cruiser tank but with heavier armour. It would have weighed 32 tons, an increase of four tons over the earlier A28 design. Like the A28 work on the A31 was abandoned at the paper stage, but Rolls Royce produced two further designs for heavy Cromwells, the A32 and A35.