Thank you for your answer Michael but I'm looking for something a little bit different.
I have those two curves below the rail cause what I'm trying to find is a curve that i can use as a rail for a ramp that starts on the floor and then gets up and finally it gets down to the floor again. For that I made those three profiles for finding what in your example is the second rail, cause that second rail is not so easy to draw. So I tried this method looking for the upper edge of the surface that resulted from the tree profiles and one rail sweep. That edge is what I'm looking for but the sweep makes that S transition i mentioned earlier and i know you have it in your todo list.
I can't just draw an upper rail from the beginning because I want a soft curve that starts on the floor, gets up and then gets down again. Whats hard of this is that I draw the first curve on the top view, but sometimes that curve has a lot of points and lifting the middle part of that curve point by point gives me an irregular curve.
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