Bogie for subway teach I. Main Technical Demands: Protection is the Only Criterion Bogie frame castings are usually not normal Solid iron sections. They bear the entire bodyweight with the vehicle physique and passengers and continually face up to several impacts and vibrations from the track. Their technical specifications revolve https://www.geto.space/post/72795_in-curved-sections-or-areas-with-frequent-braking-the-surface-of-the-rail-will-d.html 
The Core Technological Demands And Challenges of Castings for Bogies
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