In doing some test runs on my track, I noticed some of my rolling stock was wobbling along the rail to varying degrees... some very little shake, some exhibited an obnoxious amount of shake. In reading some reviews in Model Railroader, I noticed they talk about the weight being under or over by xxx ounces. I can tell that my cars that wobble are lighter than those that do not wobble. My question is, does anyone have a table that states what the proper weight is supposed to be for various sized HO equipment? I would like to get rid of the wobble, but at the same time not make the cars so heavy that my engines have a hard time pulling them up the grades. Thanks, --Rob.