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"Dynamic Track (curves) in multiple tracks"

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landnrailroader (57 posts)
Nov-15-01, 10:13 AM (EST) "Dynamic Track (curves) in multiple tracks" There has been a lot of grief concerning the use of Dynamic sections where multiple tracks are involved. Here is my explanation for the method that I have been using, which makes it RELATIVELY easy to do. I agree with others who have said that you should not put back to back dynamic sections in a file. Although it is not quite correct to do so, I have been putting 10m straight sections between variations in curves (or longer if the situation requires it).For double track (I did do one with three tracks, but I prefer to retain what hair I have left).First lay one curve, preferably the inside curve and adjust it to fit your situation. When you are satisfied, record the curvature values, radius & sweep angle, as well as any tangent lengths you have. Jot them down on paper. Next, conclude the curve with a 10m piece of double track, oriented correctly, to form the end for the 2nd track.Next lay the second curve. Note that MSTS uses circular curves without spirals. If there are any tangent pieces, make them the same length as those previously used. Now, set the radius of curvature for the new track, 3.5 meters greater than the previous curve, assuming you laid the inside curve first. (or 3.5 meters less, if it was the outside curve). This should bring your second track, very close to fitting.Now zoom in very close, and straight above, the joint you will be making with the 10m straight section. Zoom out, just enough to be able to see the 10m section, and the end of the new curve. Carefully, adjust the curvature and radius of the new curve until you have exact alignment, visually. Note that if there is a variance in elevation in the curve, lateral position may also appear to change. Tweak the new curve, until you have an exact match, visually. Now deselect the dynamic piece and the blue post will either disappear, or if it is still present, it's relationship to the blue post on the end of the 10m piece will indicate what further adjustment is necessary.Left-hand curves will be much easier to handle than right-hand, but the general process is the same, just remember to hit the "T" key before adjusting a right-hand curve.J. H. Sullivan, P.E.
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