Impossible Curves (help for newbies)
When laying the track for the version 2 of the Kingsport Sub. (CSX, Clinchfield), inevitably one comes to a difficulty, so I will explain how I will CHEAT a bit to take care of the problem. In the image, the buzzard is looking more or less south at the north end of Boody which is a controlled siding that was also once the interchange point with the N&W(NS) and most of the associated tracks are still in place although they do appear to not be used much in GE aerials. A few hundred feet further, we encounter a 14 degree curve and we are using M-track spacing, so here is how I will cheat. The required radius is 1746/14 = 124.7 meters. So for the inside curve, I will used fixed pieces of 120 meter radius with a few pieces of M-track 10 degree thrown in so that I maintain the right-hand track as close as possible to the digitized path. At these locations, I will use M2Track 10 degree curve and I will connect those pieces on the outside curve with dynamic pieces of approximatlely 124 meter radius. Eric has done a great job of correcting many visual errors in dynamic track but if you turn more than a few degrees on a grade, unpleasant things happen. And for real fun, try a 180 degree, i.e. 3.1416 radian turn with dynamic track - nope won't work.
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Jerry Sullivan
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Jerry Sullivan