Overview of RR Classes
The A class, and the preceding M class of 1904 and R class of 1910, were closely related designs ideally suited to hauling heavy coal trains a relatively short distance.
These three classes (and the larger wheeled P class) were designed for work on the Rhymney Railway, replacing smaller locomotives. When the smaller railway companies were forcibly merged into the Great Western Railway (GWR) in 1923, these modern 0-6-2's were in generally good order (some were a few months old) and had proved successful. Collectively they became the blueprint for the 200 strong GWR 5600 Class.
Read more about this topic: Rhymney Railway A Class
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