I too have PointCloud issue, saw it reported long time ago, thought You were working to fix it.
I attach my simplified scene.
I think it's a different issue, although i would need to compare both scenes to be sure.
The problem in your scene is due to the limitations of point cloud in RailClone: some deformations are not computed along the full segment, but by "steps".
That is done by performance reasons. Although in this case the model is simple, in more complex objects the performance hit would be significative.