I didn't like the guard rails that came with Carrera Go sets so I made my own using Carrera Go guard rail supports and Evergreen styrene.

I modified the Carrera Go supports using a razor saw, inserted a .080 x .080 styrene post into the support and then glued a length of .060 x .080 styrene to the post.

This gave me a flat surface to glue styrene guard rails to the posts.

Here is a back side view of the completed guard rails and posts inserted into the modified supports.
Regards,
Frank