The A10 Baldwin class steam locomotive was a 4-4-0 locomotive of the Queensland Railways (QR). The locomotives operated on 3 ft 6 in (1,067 mm) gauge. The “A”, is used to identify the number of coupled wheels, being four coupled wheels for the A10 class, followed by numerals indicating the cylinder diameter of ten inches. Baldwin indicates that the builder was the Baldwin Locomotive Works, United States.