This is an interesting style. To make things easier, i've used two generators: one for the handrail, and other for the cables and posts.
- The handrail is a simple generator using Default->Scale mode and Corner->Bevel.
- To create the corner, i composed two posts with an empty segment. I defined 30cm. of Left and Right padding to this segment, so posts are separared 60cm. between them.
The trick here is that when RailClone uses a Compose operator with an uneven number of segments for a Corner, it places the middle piece centered with the vertex.
- For the cables, i simply turned off Corner->Bevel. In this way, cables are extended only until the Corner segment (the posts). I also set Default->Mode to Scale for optimization purposes, but this is optional.