These are trains skipping and bypassing Visakhapatnam station. But in BZA-bbS section crew change is required at VSKP. So they change at simhachalam north.
please wait...Translate to HindiYeh trains Visakhapatnam station ko chhodkar aage badhti hain. Par BZA-BBS section mein crew change VSKP mein zaroori hai. Isliye woh Simhachalam North mein change karte hain.