Hi C. Lonie.
Not sure whether this is exactly what you are looking for, but just made a brief Railing where segment consist of Balustrades+Toprail, then there isa Post added to the node (Like nodes/corners on he construction line of the Rail) Alle Materials should be Generic Structural, so you can change them to Wood or steel...
I´v added the rail as a Favorite (xml) sp you should be able to import it via the Favorites palette:
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AC 13 +