Railway Castings, as important load-bearing parts in railway devices, have their inside microstructure immediately identifying the functionality and service lifetime. Metallographic Examination, by revealing the microstructure features of components, provides a immediate foundation for the quality evaluation of track castings. one.Technical methods of metallographic Assessment 1.one M... https://www.friend007.com/post/558827_this-is-the-periodic-wear-on-the-top-surface-of-the-rail-resembling-waves-when-t.html