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 Fell locomotive 

Hi, do you have any more information on the Fell's superchargers?  Clough says ""turbochargers"" (which I think is reasonable to infer as ""mechanically-driven centrifugal""), but the small-scale GA drawing shows the sort of asymmetry that would suggest Roots (and not vane either). I have no idea who Holmes-Comerville were.  Do you have any better sources on the Fell?  I presume there are I. Loco E. papers on it, but I don't have anything myself.   "