This locomotive was built in 1900 by the Avonside Engine Company for the Burry Port & Gwendraeth Valley Railway.as an Avonside 16in o-6-0ST. It was one of seven such locomotives built for the line.
In 1914 it was sold to Llewelyn (Nixon) Ltd (later Mountain Ash Colliery and subsequently part of the National Coal Board on nationalisation of the industry).
The locomotive was rebuilt in 1953 as works number 1875.
In 1962 it was transferred to Penrikyber Colliery where it became NCB No11. It worked at the colliery until one diesel replaced it and another steam locomotive.Pontyberen wasretained for a short period but was withdrawn from service in about 1970.
The locomotive is now preserved on the Pontypool & Blaenavon Railway