Train originating from tata, convinent to board and the deboard at Duvvada. Train 18189 TATA-ERS Express, and can save some pocket expense upto some extent. Then take 18519 VSKP-LTT Express to reach Secunderabad. Might take more time than 12703 but its the alternative to 12703 Falaknuma Express only if vacancy is not available. Buffer time is enough and there wont be so much delay that you can miss the train. If 18189 is rescheduled by +1 hrs then might be possible to miss the train.