I would say no matter how much SCR speeds it up it will go up to 28 hrs, with less TAT on either side of its terminal, which will delay the train horribly in case of diversion. It will result in higher cancellation. Rather they should speed it up reasonably and maybe extend it to Nanded with PM at NED with General Quota upto charlapalli, which will be the only connection from NED, NZB to southern AP. 4 rakes will be needed anyway and that will guarantee it. Then in that case, Sabari can simply run upto Kanyakumari in case of space issues at TVC.