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There is a picture of Bulleid Chain drive in "British Pacific Locomotives" by C.J. Allen, a very good book but very English. There must be a picture of it on the web somewhere as it is a very difficult gear to describe, but if you see a diagram of it all becomes clear. It cannot have been all bad as BR did not bother rebuilding all the Bulleid pacifics and the unrebuilt ones lasted to the end of steam and several unrebuilt ones still run with the gear.
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