Bogie for subway practice I. Main Technical Necessities: Safety is the sole Criterion Bogie frame castings are not common Forged iron parts. They bear the complete body weight of the car human body and travellers and repeatedly face up to many impacts and vibrations in the monitor. Their specialized needs https://talkitter.com/post/456844_with-the-development-of-big-data-the-internet-of-things-and-artificial-intellige.html