Therefore in 1938 a batch of five locomotives were built without streamlining at a cost of £10,659, starting with 6230 "Duchess of Buccleuch".
Therefore in 1938 a third batch of five locomotives was built, Nos.6230-6234, without streamlining at a cost of £10,659 each. The first of this batch was No.6230 "Duchess of Buccleuch".