3D Railings are archicad object tools.
You can simple draw a 3d polyline both 2d and 3d window. You can create curved and sloped path. There are many parameters for post, panel, cable, handrail; you can create you own rail. An option for list allow you to have the railing straightened in the schedule also with quantities for each elements of the railing. You can quickly manage in 2d/3d windows the position and visibility of posts and cables/panels.