This loco has a very interesting history. It was one of a class of 7 locomotives built by Avonside and Chapman & Furneaux (Gateshead) 1900-07 for the Burry Port & Gwendraeth Valley Railway; No.1421 was BP&GVR No.2 "Pontyberem" and they sold it in 1914 to Llewelyn (Nixon) Ltd (later Mountain Ash Colliery and later part of the National Coal Board). In 1962 it was transferred to Penrikyber Colliery and withdrawn about 1970. This loco and Barclay 0-6-0ST No.2074 of 1958 "Penrikyber No.1" worked the yard of this colliery until 1968 when one diesel shunter replaced them. It was decided to keep one of the steam locos as standby and, amazingly, it was decided to retain the 68-year-old Avonside loco rather than the Barclay one, even though it was only 10 years old! No.2 must have been very highly regarded and it had a long working life. Fortunately, it is now preserved.