Up to RU comes minimum 40 Mints late. From RU to TPTY covers at least 15 Mints. That's all. after that Loco pilot wish and controller don't care when he want to go to chitoor. train will on move only but u feel better go by walk to reach fast or to catch a bus as this train will never go up to 30 KMPH also. When ever i travel in this train with family or alone always reach minimum 50 Mints late. Once when i was traveling in this train it was diverted via KZJ-BZA and by surprise to me it arrived 15 Mints before to TPTY and CTO though it came in long route. but coming from CTO-TPTY it will like Bullet train and reaches TPTY always before 10 Mints than scheduled time.
But...
more... this is heavy Demanded Train for TPTY as convenient timings. and Faster train to Rayalaseema area than Rayalaseema Express.