Notes
1 Railways and Industry in the Sirhowy Valley: Newport to Tredegar & Nantybwch, including Hall's Road. By John Hodge. 312 pp., illustrated. Barnsley: Pen and Sword Transport, 2020. (HB). ISBN-10: 1526762560
2 Early Wooden Railways. By M. J. T. Lewis. 436 pp., illustrated, with plans and maps. London: Routledge & Kegan Paul, 1970. (HB). ISBN 978-0710066749