A new production AF by Lionel 3 bay hopper weighs 4.8oz, one ounce light. They run fine, I have pulled as many as 20 around the layout with no issues. A two bay MTH S scale covered hopper weighs 5.9oz, 1/2oz heavy per the NASG standards. I think these cars are within tolerances for use in long consists on layouts with good track.
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