The Gwili Steam Railway operates a standard gauge preserved railway from Bronwydd (near Carmarthen) in South Wales along a short section of the former Carmarthen to Aberystwyth railway that closed for passenger traffic in 1965, the track being lifted in 1975.
The Gwili Railway was formed in 1975 and, by 1978, had purchased and rescued about eight miles of trackbed and was running an initial steam-hauled service on a one-mile section of it. The Gwili Railway has the distinction of becoming the first standard-gauge preserved railway to operate in South West Wales when it re-opened the one-mile section of the Carmarthen-Llanpumsaint route from its base at Bronwydd Arms, three miles north of Carmarthen. Since then, the railway has expanded to Danycoed and the company continues to hope to expand to Llanpumsaint.
Currently, the railway is working south towards Carmarthen to a new station called Abergwili junction which will be located alongside the roundabout at the northern end of the A40 Carmarthen By-pass. The locomotive stock of the Gwili Railway is unusual in that it mostly represents local industrial and wartime operations rather than mainline services.