The first section of the South Wales Railway (SWR), that between Chepstow and Swansea, opened on 18 June 1850.
The original stations on that line included one named Llantrissant for Cowbridge.

The station became a junction with the opening of the first section of the Ely Valley Railway (EVR) to Tonyrefail on 2 August 1860, although passenger services along that line did not begin until 1 August 1865.
The EVR opened a branch to Brofiskin Colliery in 1862, and another railway, the Llantrisant and Taff Vale Junction Railway, which opened in December 1863, intended to use part of that branch to gain access to Llantrisant via a connection at Maesaraul Junction, but in order to do this, the Brofiskin branch had to be altered to mixed gauge - this occurred in December 1864.

The station name was simplified to Llantrissant c. 1866, by which time the SWR had amalgamated with the Great Western Railway (GWR) in 1863.
Adjacent to this station was the terminus of the Cowbridge Railway, which opened on 18 September 1865, originally being named Llantrissant.
The Cowbridge Railway was leased by the Taff Vale Railway (TVR) in 1876, and absorbed by that concern in 1889.
Both the GWR and TVR stations had their names amended to Llantrisant by 1902.
The TVR in its turn amalgamated with the GWR on 1 January 1922, and on 21 September 1925 their respective stations were merged as a single station.

Llantrisant was a major intermediate station on the South Wales Main Line.
It consisted of two central through platforms and bays for the Ely Valley line, the Llantrisant & Taff Vale Junction line and the branch to Cowbridge and Aberthaw.
The station was closed on 2 November 1964.
Under the auspices of Regional Railways sector of British Rail and Mid Glamorgan the station was reopened.
 The station was rebuilt and reopened as Pontyclun on 28 September 1992.

Extensive sidings existed around the station for the coal and mineral traffic generated by the mines in the area.
At least the line to Cwm Colliery was in regular use until 1984.
The first section of the South Wales Railway (SWR), that between Chepstow and Swansea, opened on 18 June 1850. The original stations on that line included one named Llantrissant for Cowbridge.
The station became a junction with the opening of the first section of the Ely Valley Railway (EVR) to Tonyrefail on 2 August 1860, although passenger services along that line did not begin until 1 August 1865. The EVR opened a branch to Brofiskin Colliery in 1862, and another railway, the Llantrisant and Taff Vale Junction Railway, which opened in December 1863, intended to use part of that branch to gain access to Llantrisant via a connection at Maesaraul Junction, but in order to do this, the Brofiskin branch had to be altered to mixed gauge - this occurred in December 1864.
The station name was simplified to Llantrissant c. 1866, by which time the SWR had amalgamated with the Great Western Railway (GWR) in 1863. Adjacent to this station was the terminus of the Cowbridge Railway, which opened on 18 September 1865, originally being named Llantrissant. The Cowbridge Railway was leased by the Taff Vale Railway (TVR) in 1876, and absorbed by that concern in 1889. Both the GWR and TVR stations had their names amended to Llantrisant by 1902. The TVR in its turn amalgamated with the GWR on 1 January 1922, and on 21 September 1925 their respective stations were merged as a single station.
Llantrisant was a major intermediate station on the South Wales Main Line. It consisted of two central through platforms and bays for the Ely Valley line, the Llantrisant & Taff Vale Junction line and the branch to Cowbridge and Aberthaw. The station was closed on 2 November 1964. Under the auspices of Regional Railways sector of British Rail and Mid Glamorgan the station was reopened.  The station was rebuilt and reopened as Pontyclun on 28 September 1992.
Extensive sidings existed around the station for the coal and mineral traffic generated by the mines in the area. At least the line to Cwm Colliery was in regular use until 1984.
Pontyclun railway station