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.
Llancaiach Branch
The "'Llancaiach Branch" railway line was a mineral branch line in Glamorganshire, South Wales. It was authorised in 1836 as part of the Taff Vale Railway, and its purpose was to connect collieries at Llancaiach and bring their output to Cardiff for onward shipment. It was designed by Isambard Kingdom Brunel and built on the standard gauge. It opened in 1841 from a junction (later known as Stormstown Junction) with the Merthyr line immediately south of Abercynon (then called Navigation House). It was intended to be horse worked, and included a self-acting rope-worked inclined plane near the junction. The collieries were slow to use the line, preferring their customary use of a tramroad and the Glamorganshire Canal, and the value of the line was diminished when the "Taff Vale Extension line", an east-west connecting line belonging to the Newport, Abergavenny and Hereford Railway, intersected it and cut off the colliery connections, and the line became dormant.