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I don't see any need to get overly technical about this. NMRA says approx 60' = 1 scale mile. If you use a common 3' section of track on a flat portion of your layout, and your loco takes 6 seconds to traverse that distance, you are moving about 30 smph; 4 seconds equals about 45 smph which is a good speed for freight; and 3 seconds equals about 60 smph good for passenger trains. <br />We have taken a 3' section, marked the beginning and the end and use a stopwatch, or even an ordinary watch with a second hand. We can closely estimate train speed for all intents and purposes. We like to spend more time enjoying our operating sessions than getting caught up in measuring decimals. Hope this works for you.
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