Railway Castings, as key load-bearing elements in railway techniques, have their internal microstructure directly determining the overall performance and repair daily life. Metallographic Examination, by revealing the microstructure qualities of resources, gives a immediate basis for the standard assessment of observe castings. 1.Complex ways of metallographic Examination one.1 Metall... https://www.friend007.com/post/558827_this-is-the-periodic-wear-on-the-top-surface-of-the-rail-resembling-waves-when-t.html