Now you want Rajadhani halt ? Lol, draw a line for your greed. Khammam station is just 100 kms far away from both BZA and WL and located exactly in middle of these two stations. Long distance premium trains need not stop here. TN stop is not necessary, you can ask for other trains like as you mentioned Vskp Ltt and others like Vskp SJ, Sambhalpur Nanded etc.