Thanks for letting us know.
Could you please let me know which versions of RailClone and Unreal you are using?
It looks as though it's the deformed sections that have gone missing. This may need to be reported to Epic as they are responsible for the plugin that exports RailClone and FP objects via Datasmith. We have no control over that part of the pipeline except to provide the API that they use. I'll see if I can reproduce it here, and get in touch with them.