 BP&GV 4 Kidwelly and 5 Cwm Mawr

The Burry Port and Gwendraeth Valley Railway (BP&GV) numbers 4 "Kidwelly" and 5 "Cwm Mawr" were small 0-6-0ST steam locomotives, originally built by the Avonside Engine Company in May 1903 and April 1905 respectively.They belonged to a series of seven 0-6-0ST locomotives numbered 1–7 built between 1900 and 1907 for the BP&GV to replace older locomotives; five were built by Avonside and two by Chapman & Furneaux, each of the seven being different from the others.