R. J. Caston & John Hodge 
Railways and Industry on the Brecon & Merthyr [PDF ebook] 
Bargoed to Pontsticill Jct., Pant to Dowlais Central

This book on the Brecon & Merthyr, deals with the section from Bargoed to Pontsticill Junction, covering the line built by the B&M to join onto the section running north from Bargoed built by the Rhymney Railway, much dominated at the time by nearby Dowlais Ironworks. Included is the short section from Pant to Dowlais Central. It contains photographs of every location along the line, including many that have not before been published. The volume includes a fascinating account of the Pantywaun Marshalling Yard, operative until Dowlais Ironworks ceased production, when the B&M ran freight services to and from Pantywaun, before the many collieries and levels in the area were closed almost overnight and the location finally obliterated under the development of Cwmbargoed Opencast.