Railway Castings, as key load-bearing factors in railway devices, have their inner microstructure straight identifying the efficiency and repair daily life. Metallographic Evaluation, by revealing the microstructure features of resources, provides a immediate foundation for the quality evaluation of track castings. 1.Technological methods of metallographic Assessment 1.1 Metallographi... https://www.friend007.com/post/558581_rail-grinding-this-art-carried-out-amid-sparks-flying-quietly-safeguards-the-hea.html