The first run of Lionel/Flyer cylindrical hoppers will have "high water" trucks equipped with out of gauge scale wheels.? The second run had "high water" trucks and hirail wheels.? The last run had hirail wheels with corrected trucks.
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Lionel has not offered any scale conversion wheels separately for this car.? After a decade they are not likely to.
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The attached photos shows a converted first run vs. unconverted first run and the truck on a turnout.? The converted car has AM trucks.
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Rich G(ajnak)