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Chris...Andrew's method works well, looks good, and as he says, it's easy. One thing I like to keep in mind is the NMRA recommended weight for cars, as it is definitely a tool for consistent performance....and the lower the better for the extra weight. For HO, it's 1 oz. plus 1/2 oz. per inch of actual length...so a 40' hopper car should weigh around 3.75 to 4 ozs....an Athearn 40' Quad hopper would only weigh about 2 ozs. if completed as an empty car. Adding the foam weight might only add 1/2 to 3/4 oz., and it would be adding most of the extra weight high up in the car. So I like to add some of that aquarium grit, or sandblast "coal" material down in the bottom of the car, down in the hopper chute \ door area. Making this weight a solid mass with thinned white glue prevents any future spills, but I leave it "loose". best regards, Merry Christmas, Mike[:)]
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