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The key here I think may be the combination of "Rivarossi" and "code 83". Many Rivarossi locos have oversized wheel flanges that make running them on track smaller than code 100 somewhat iffy. The flanges bottom out on the ties and guard rails especially on turnouts. Some Rivarossi locos have been upgraded including smaller flanges, but may still have trouble on smaller than code 100. You may get more and better replies in the Model railroading forum. Ron
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