Records, 1883-98, relating mainly to a case of alleged breach of contract between the Rhondda and Swansea Bay Railway Company and William Jones of Neath, building contractor. They include the records of the Rhondda and Swansea Bay Railway Company, 1878-1894, mainly financial; account books of William Jones of Neath, one of the contractors involved in building the Rhondda tunnel, 1884-1898, and papers relating to the breach of contract, 1884-1896, brought by William Jones against the company.

The file comprises papers relating to the project to re-open the disused Rhondda tunnel as a multi use trail.