The services are currently operated by Arriva Trains Wales. In total, it serves 81 stations in six unitary authority areas: 20 in the city of Cardiff, 11 in the Vale of Glamorgan, 25 in Rhondda Cynon Taff, 15 in Caerphilly, 8 in Bridgend and 5 in Merthyr Tydfil. Services on these routes are provided with Class 121, 142, 143 and 150 DMUs, and are typically end-to-end, in that they run from one branch terminus, through Cardiff Queen Street station, to another branch terminus, e.g. from Pontypridd to Barry Island.