Llantrisant and Taff Vale Junction Railway
In time the Canal became overwhelmed by the volume of traffic, and encouraged by the successful opening of railways with more advanced technology than the horse tramways of previous years, the Taff Vale Railway was promoted. It was authorised by Parliament in 1836 and it opened between Merthyr and Cardiff docks in 1841. The line passed close to the Maesmawr workings but did not make a connection.
Taff Vale Railway
Closures in the mid 20th century left the Taff Vale as the only railway route to Merthyr Tydfil. Plymouth Street goods station was closed in 1968. The line from Black Lion signal box (Merthyr Vale) to Merthyr Tydfil was singled in February 1971. As mineral traffic declined, the quadruple track south of Pontypridd was unnecessary, and it was reduced to double line in 1980.