Here Wells collects it train at Oxenhope
Here you see the chain driven valve gear in the oil
bath. Many thanks to the Southern-Locomotives
The sides of the oil bath are indeed the frames and 
leather cup seals were used when these were first 
built which were prone to heavier leakage as the
 seal broke down . Later modern materials such as 
neoprene have done much to reduce this difficulty.
Further details and description can be found at 

 
 
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