We can't run away for long from the fact that the bare minimum requirement for the north east towards south India is having DAILY, DEDICATED trains from GHY to MAS, SBC, TVC and SC each. This one-day-to-TVC, three-days-to-SBC trend won't help for long.
No Antyodaya, no Humsafar no fancy names. Plain simple superfast trains. The earlier IR realises this, the better.