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Another aspect that makes a flyover more convient is if you have the lower track drop and the higher track rise. This way you can get the 3-4 inch seperation in half the distance. So for a three percant grade each track would need 4 feet from the flyover to get to the desired height. With a 4 percent grade your looking at 3 feet from the flyover. This way you have a steeper grade but it is for a shorter distance then if you went one track level and the other raised. Hope this helps <br />Andrew <br />Edit-I was assuming HO scale for these calculations
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