The main part of the wheel tread is an inward inclination of 1:40 . In order to make the top of
the rail track under the wheel load with cone tread stressed uniformly ,decrease load
offset, reduce rail web stress , avoid slit between rail head and rail web, the railway track
shall not be laid upright for straight line, it shall be inward inclined ,this inward inclination of
rail called Rail Cant, it is a high precision ,portable , numeric rail geometrical testing tool.