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I read this then went down to the "Junk Yard" to find an old Tyco Mantua F7 I knew I had. Coincidently my Dad had one of these when I was 4. Anyway these engines if the same as yours have rear wheel drive only. The two forward sets of wheels are solid brass on the left hand side and a hard plastic on the right hand side. On the rear truck the solid brass is on the right and the plastic on the left, which is grooved for a traction tire. The thing that struck me when I first picked this old brute up was the amount of crud that was built up around the traction side of the rear truck. Crud as I call it is a combination of dust, dirt, oil and oxidation from the rails. Considering how old this unit is it would have run on brass rails at one time and what you could be mistaking for metal metal flanges could possibly be polished crud, aka old brass oxidation. Sound plausible? <br />
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