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