If you get an error when using the Marking Lines models from the library of RailClone Pro 1.01, please use the attached file to replace the material library located at:
C:\Program Files (x86)\Itoo Software\RailClone Pro\lib\default1\mentalray.mat
The updated library include the material 'rc_marking' for Mental Ray, that was missed in the original files.
Update: The attachment is removed. the material library is already updated in RailClone 1.0.2