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Glen is correct. Another way, without trig, is this. <br />With a 1 degree curve, the loco travels 1/360th of a complete circle. If he did this 360 times, he'd have a complete circle and the circumference is 360 times 100 feet, or 36,000 feet. From that you can compute the radius: radius equals circumference divided by 2 pi (6.28). <br />If it was a 2 degree curve, you'd multiply 100 feet times 180 (360/2). <br />But again, this is not exact as we are using the chord, not the length of the arc; but for degrees less than 5, this is fairly accurate but always a little less than the actual radius.
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