They should leave those old trains. Already the 3 daily trains running to Chennai are speed up last Udyan and LTT CBE express are pending. They should introduce new SF to Chennai and Benguluru with triweekly SF both sharing slot upto Guntakal with stops at Kalyan, Pune, Solapur, Gulbarga, Wadi Raichur Guntakal ATP/Kadapa to Chennai Benguluru from LTT with immediate effect and not wait for upgraded trains to come in later years.