Bogie for subway prepare I. Core Technological Demands: Protection is the Only Criterion Bogie frame castings are usually not regular Solid iron sections. They bear the whole fat with the vehicle physique and passengers and continually face up to several impacts and vibrations from the track. Their technical specifications revolve https://expressafrica.net/post/400447_in-curved-sections-or-areas-with-frequent-braking-the-surface-of-the-rail-will-d.html