Ffairfach is a village one-half mile (0.80 km) south of the market town of Llandeilo in the eastern part of Carmarthenshire, Wales.

[3][4] The stone used to build the nearby Llandeilo Bridge (1848) was excavated from a quarry near the signal box at the side of the railway and immediately below Rock Villa at Ffairfach, after satisfactory tests for quality.

Ffairfach railway station lies on the Heart of Wales Line which runs between Shrewsbury and Swansea.

Passengers from the Amman Valley and Carmarthen usually alighted at the Ffairfach stations, as they would save 1+1⁄2 pence on the return fare, which meant a great deal in those days.

Three-quarters of the commerce of the town of Llandeilo at this time came from the south of the Tywi bridge; consequently Ffairfach became important, for rail and road passengers made use of the village as the first stopping place en route for Llandeilo.

The second was built by the London North Western in 1865 Carmarthen to Llandeilo through the beautiful vale of the Tywi.