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I am now well past the point where the two tracks abutt each other and lo and behold it worked out exactly correct, the descending ramp at the rear is exactly 1 cm higher than the ascending ramp at the front. So the rest of the gradient at 1.5 % should mate precisely with the shorter ascending ramp at 2 %. These are two parts of a reversing loop and they must both start and end at the same place.I knew you all would be interested.Rgds Ian
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