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.
Tonteg Halt railway station
The station on the Taff Vale/Llantrisant and Taff Vale Junction Railway was opened on 1 May 1905, originally being named "Tonteg Platform"; and extended in length on 7 October 1910. The station consisted of a single platform accessed via a still existing footpath from the road. Immediately to the east of the station was a small stone bridge over said road. On 1 October 1923, it was renamed "Tonteg Halt". This station existed until 5 May 1930 when it was closed along with the line from Tonteg Viaduct to Llantrisant Junction because of the construction of a chord from Tonteg Viaduct to Tonteg Junction to connect with the Barry Railway. This new chord was brought into use on 5 May 1930, at the same time the chord to Llantrisant Junction closed.