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To get good control on twist I would use LOFT for curved sections of the railing,
For my first attempt at a 90° rising corner I used 4 cross sections. I copied a cross section from the end of the bottom straight railing and then rotated it by 30° about the world Z axis. The 3rd section was rotated by 60°. The section for the beginning of the top straight section was rotated 90°.
Note, the magenta line is a spline that was constructed using the CV method ensuring that the slope of the curve was tangent at the two ends to the straight railings to which they mate.
I did not like the result as the there was an undesirable twist/bulge midway through the curve which you can see better in the image below.
To correct this I rotated the 2nd and 3rd sections about their local Z axis. To gauge the amount of rotation I created construction lines from the top center of each straight railings (red lines) then used these to create a smooth spline (white) with CVs at each end and one at the intersection of the two red lines. Using these 3 CVs ensured slope tangency at the ends. Using UCS OBject I could then use 2D rotate and adjust the rotation until the top center of the cross section was by the top magenta spline.
Note, I tried using sweep with guides and paths but could not get much control of the twist or teeter. I think lofting is the best approach.