sorry...
1] already kochuveli - dehradun xpress running... IR would, if needed, would increase frequency...
2] Tirunelveli pax would like short distance to go to DDN ie. through TN, AP, TG, MH, MP, UP, DL, UK route.. than travelling thru KR, Konkan route.. in that case, MDU - DDN express would be extended to Tirunelveli ..