Origins
When the GWR took over the Welsh valley lines, they discovered that the Welsh locomotive crews liked their 0-6-2T locomotives. Rather than a new design the 5600 Class was a "Swindonised" version of the Rhymney Railway M class and R class locomotives. The 1904 M class (and the similar 1909 R class) were successful designs ideally suited to hauling heavy coal trains a relatively short distance.
The 5600 Class was specially designed for work in South Wales, replacing the elderly, worn-out locomotives that had been 'inherited' in 1923, when the smaller railway companies were forcibly merged into the GWR at The Grouping. Contrary to this trend, the Rhymney Railway's more modern 0-6-2s were in generally good order and had proved successful. Thus they became the blueprint for the 56xx.
The first of five R class locos was re-boilered by the GWR in 1926 and a single M class was upgraded in 1930. In this form, both were visually almost indistinguishable from the 56 Class.
Read more about this topic: GWR 5600 Class
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