The Vale of Rheidol Railway is a 1 ft 11+3⁄4 in narrow gauge heritage railway in Ceredigion, Wales, between Aberystwyth and Devil's Bridge; a journey of 11+3⁄4 miles (18.9 km).

Ceredigion ( ), historically Cardiganshire, is a county in the west of Wales. It borders Gwynedd across the Dyfi estuary to the north, Powys to the east, Carmarthenshire and Pembrokeshire to the south, and the Irish Sea to the west. Aberystwyth is the largest settlement and, together with Aberaeron, is an administrative centre of Ceredigion County Council.