M J T Lewis, Early Wooden Railways, Routledge and Kegan Paul, London, 1970, 0 7100 7818 8 Bertram Baxter, Stone Blocks and Iron Rails, David & Charles, Newton Abbot, 1966 In 1824 transport efficiency was improved by the opening of what became known as the Cwmavon Tramroad, 3 miles in length and again horse-operated.