sentences:  The first was in 1885 on the Taff Vale Railway the design being by their mechanical engineer Tom Hurry Riches, father of Charles T. Hurry Riches who was the designer of the Rhymney Stephensons.The suitability of the type was because the nature of the work they undertook demanded high adhesive weight, plenty of power with good braking ability, but no need for outright speed, nor large tanks or bunker as the distances from pit to port were short.These Welsh locomotives were taken over by the GWR at the grouping in 1923 and many, including seventeen of the Rhymney A, M, P and R's, were rebuilt with GWR taper boilers.