From the ME index, may help
I don't have copies
170,3944,516,Road Locomotive,Clayton Wagon. General Notes,1,Bernard Lundberg,Discusses the final major
assemblies to upgrade the published description into a near perfect detailed scale model. Gear ratios – not a new problem! An easily solved problem
170,3946,652,Road Locomotive,Clayton Wagon. (Axles),2,Bernard Lundberg,Designing a correct to prototype front axle assembly
171,3948,28,Road Locomotive,Clayton Wagon. (Axles),3,Bernard Lundberg,"More details of the axle, differential gear case cover, other parts, more snippets form the IPC, pump controls"