Hi,
Well, an work-flow similar to one shown in the "
Help with Lamellas travelling along 2 splines" thread might be an possible option, but honestly the RailClone plug-in isn't designed for this kind of tasks (like advanced editing splines) and probably there would be easier & quicker ways to archive it.
Please find attached sample scene using a surface to conform Segments over it. Hope that helps a bit.
Best regadrs,