Bogie for subway practice I. Main Specialized Needs: Protection is the Only Criterion Bogie frame castings are certainly not regular Forged iron elements. They bear your complete excess weight on the auto body and passengers and constantly stand up to several impacts and vibrations from the track. Their technical specifications https://vherso.com/post/568829_with-the-development-of-big-data-the-internet-of-things-and-artificial-intellige.html