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Hello totara, OO is 1:76 scale, which places it almost exactly between HO (1:87) and S scale (1:64). The National Model Railroad Association recommends an initial weight of 1 ounces for an HO scale car, plus 1/2 ounces for each inch of body length. For S scale, the NMRA recommends 2 ounces initial weight with 1/2 ounce per inch of body length. So, we can extrapolate for OO scale an initial weight of 1.5 ounces plus 1/2 ounce per inch of length, a formula which I would tend to apply to rolling stock with two bogies. For shorter, two-axle rolling stock I would opt for the HO scale recommendation. Hope this helpful, Paul Schmidt Contributing Editor Trains.com
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