Bogie for subway train I. Main Technical Necessities: Safety is the sole Criterion Bogie frame castings are not common Forged iron pieces. They bear the whole fat of your car entire body and passengers and repeatedly face up to many impacts and vibrations in the track. Their technical needs revolve https://youslade.com/post/339439_with-the-development-of-big-data-the-internet-of-things-and-artificial-intellige.html