Credits:- to Nikhil Khurana /blog/post/4437404
So soon these two following trains going to extend till Visakhapatnam.
18311 Sambalpur - Manduadih Express may extend till Visakhapatnam
This train already halts at 35 stations don't know after extension how many more halts will added.
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18301 Sambalpur - Rayagada Intercity Express may extend till Visakhapatnam.
I still believe these two trains extension are not need or unnecessary' new trains with good Time Table is best option.
However 67292 Visakhapatnam - Vizianagaram MEMU extension proposal till Salur is good one or useful.