In 1845 the "Llynvi Valley and South Wales Junction Railway" was promoted. It would run directly down the Llynfi valley to Tondu, and then run west past Pyle to join the proposed South Wales Railway at Margam. The name of the company was changed during the Parliamentary hearings and it was the "Llynvi Valley Railway" that was incorporated on 7 August 1846, with authorised capital of £200,000. It was to acquire the DL&PR and convert it to modern railway standards, and to introduce locomotive operation. As the South Wales Railway was being built on the broad gauge and was to be the only main line railway in the vicinity, the Llynvi Valley Railway was to adopt the broad gauge as well.