Railway Castings, as vital load-bearing components in railway methods, have their interior microstructure instantly determining the efficiency and repair lifetime. Metallographic Examination, by revealing the microstructure traits of materials, delivers a direct basis for the standard assessment of observe castings. 1.Complex ways of metallographic Examination one.1 Metallographic Exa... https://www.reddit.com/r/TrainPorn/comments/1o2pron/rail_jointbar/