Thank You for the scene.
We can confirm that RailClone does have trouble with this shape. Unfortunately we can't promise a fix anytime soon.
Meanwhile we have few workarounds for You.
1.Use path deform modifier.
Create RC object without x spline, just Y. And then use path deform to deform along X axis.
2. Use more regular topology for Your tile mesh:
Either torbosmoothed or not.
Also, I want to remind about curve steps parameter. It is essential in this style. Please play with to find optimal deformation.
P.S. You could use pre-turbosmoothed tile and turbosmooth whole RC object.
Feel free to experiment what works best for You.
Attaching a max file with our experiments.
Hope this helps.