Mechanical Details
Innovations included double chimneys on certain members (the only GWR class ever to have double chimneys fitted by the GWR) and a high boiler pressure of 280psi (though this was later lowered in an attempt to reduce maintenance costs). Modified double chimneys were fitted to all the class from 1956. They also pulled Hawksworth slab-sided tenders, as fitted to some of his modified Halls and retro-fitted to many earlier designs; however the County tenders had a water tank six inches wider than the tenders built for the Halls and earlier designs.
The running gear of the County was almost exactly the same as Hawksworth's earlier Modified Hall Class. The boiler however was a development that used the tooling for the LMS Stanier Class 8F boiler, Hawksworth being able to study this design closely when 8Fs were being built at Swindon as part of the war effort.
Read more about this topic: GWR 1000 Class
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