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Being new to this hobby, I recently discovered the NMRA RP-20.1 relative to optimum weight of cars based on their scale and length. Much to my surprise when I weighed the cars that I have (hoppers, tankers, boxes, flats, cabooses, etc) I found that all of them are considerably below their optimum weight. I added weight to some of them and discovered that they do truly ride more stable through turnouts, curves and slight imperfections in my layout. My question is this; If weight is important to the smooth running of rolling stock, why don't the manufacturers produce equipment that complies with the NMRA recommend practice?
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