Railway Castings, as key load-bearing parts in railway devices, have their inside microstructure right identifying the functionality and service lifetime. Metallographic Examination, by revealing the microstructure qualities of materials, delivers a direct foundation for the standard assessment of observe castings. 1.Complex ways of metallographic Examination one.1 Metallographic Exam... https://www.friend007.com/post/558827_this-is-the-periodic-wear-on-the-top-surface-of-the-rail-resembling-waves-when-t.html