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1) Add up the total number of running feet. 2) with a second hand counter watch, slect your start/finishing place 3) throttle up and tally the # of seconds it takes from start to finish in feet. 4) divide total # of feet by the # of seconds, then multiply that answer by 60, equals HO scale speed EXAMPLE,an oval tract set of of 40 feet, in 20 seconds, divide 40 by the 20 seconds, equals 2, times 60 equals 120MPH HO Scale. For 40 feet in 40 seconds, equals 1, times 60 equals 60MPH HO scale.
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