/  /1809Aerw Tramroad
Built from Treforest, on the canal, to Hafod Colliery.
07/06/1861Llantrissant and Taff Vale Junction Railway
Act passed for this Taff Vale Railway backed line. The line was promoted to stop expansion eastwards of the Great Western Railway backed schemes from Llantrisant. The line ran from Llantrisant Branch Junction, Treforest, to meet the Mwyndy Branch (Ely Valley Railway) at Maesaraul.
14/08/1884Barry Dock and Railways
Established by an Act. Led by David Davies of Ocean Collieries. The line was to run from Barry to Cadoxton Junction then north to Drope Junction for a branch to Peterston with the South Wales Railway (then a further junction, Tynycaeau Junction, with the same line from St Fagan's) and then north to the Treforest estate at Tonteg Junction for a connection with the Taff Vale Railway before finishing near Trehafod, joining the Taff Vale Railway.
12/08/1898Treforest Line (Cardiff Railway)
Railway projected from Roath to Heath (on the Rhymney Railway), Walnut Tree Gap and on to Treforest (and the Taff Vale Railway).
  /  /1909Treforest Line (Cardiff Railway)
Heath to Treforest opened, although Treforest Junction was not opened.
  /05/1909Taff Vale Railway, Treforest Lines (Cardiff Railway)
Temporary connection put in between the two lines at Treforest.
12/10/1909Taff Vale Railway, Treforest Lines (Cardiff Railway)
Temporary connection removed.
10/07/1930Barry Dock and Railways
Cardiff to St Fagans to Pontypridd, and Cadoxton to Porth diverted to parallel Taff Vale Railway routes. Treforest High Level and Pontypridd (Graig) are closed.
  /  /1940Treforest Line (Cardiff Railway)
Rhydyfelin Viaduct demolished for war effort.
  /  /1952Treforest Line (Cardiff Railway)
Coryton northwards to Nantgarw Colliery closed on opening of a spur to Nantgarw by-products Plant from the Taff Vale Railway.
  /  /1964Llantrissant and Taff Vale Junction Railway
Treforest Junction to Cwm Colliery (excluded and served from Llantrisant) at Llantwit Vardre closed.
28/09/1964Barry Dock and Railways
Treforest Junction to Cwm Colliery closed.