Rhymney Railway M class

The Rhymney Railway M class was a class of six 0-6-2T tank locomotives introduced into traffic on the Rhymney Railway in South Wales in 1904. They were built by Robert Stephenson and Company and are sometimes called the Rhymney Stephensons, even though Hudswell Clarke and Beyer, Peacock and Company supplied many of the derived designs. Each weighed 66 long tons and measured 36 feet 9 inches in length. They were designed for hauling heavy coal trains the short distance on the main line from Cardiff to Rhymney. The Rhymney numbered them 16 and 106 to 110, all passed to the Great Western Railway in 1922, and three entered British Railways stock in 1948. Together with the related R and A classes they became the blueprint for the Great Western 5600 class, and No. 47 was reboilered by the GWR in 1930.