Design
The design of the 5600 Class followed Great Western Railway practice as far as possible, by utilising many standardized parts. Included in Collett's innovations was a Standard Number 2 boiler which was suitable for the 5600 Class, and the M and R class Rhymney locomotives, complete with the traditional brass GWR safety valve casing and copper-capped chimney.
They were substantial sized tank engines, 37 ft 6ins in length and weighing 62 tons. The side tanks were capable of holding 1900 gallons of water. The high domed cab, bunker and tanks were closely related to the 31xx and 42xx classes. One hundred of the class were built at the GWR workshops in Swindon from 1924-1927.
In 1927 another 100 similar engines were constructed – these were slightly heavier and numbered in the 66xx series. Nos 6600-6649 were Swindon-built in 1927-1928, but due to the pressure of work 6650-6699 were built by Armstrong Whitworth in 1928. This resulted in some minor design differences from the Swindon locomotives.
When the Welsh railwaymen discovered that the new GWR 5700 Class 0-6-0 pannier tank (introduced 1929) was even more suitable for the same work – being shorter and lighter, with roughly the same (slightly lower) tractive effort – no further Class 56xx/66xx were built.
The 5600 Class had the distinction of being the only locomotive of 0-6-2 wheel arrangement built new by the GWR. Nevertheless, there were just over 400 of the type in service from 1940–1945, demonstrating the large number acquired in 1923.
Read more about this topic: GWR 5600 Class
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