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A precise calculation would be done this way: distance in inches x (25.4 x 5280 / (3600 x 3.5)) divided by the time in seconds = scale mph When you work out the arithmatic it is distance in inches x 10.64381 / time in seconds = scale mph This is for HO scale. Example - 36 inch flex track crossed in 5 seconds = 77 smph(HO) Enjoy - Ed
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