Here Bullieds famous valve gear as fitted to the Merchant navy class aswell as the West Country and Battle of Britain class pacifics of the southeren railway.
The subsequent rebuilds under British Railways to conventional Walschearts valve gear added to the weight of the loco reducing its route availability in rebuilt form. To the end of steam only the original unrebuilds were allowed over the far West of England lines such as from Barnstaple to Ilfaracombe.
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