Your booked bus must be originate from somewhere else and start their journey around 04:30 am and reach MGBS and will depart around 07:00 am afterwards it will complete the journey and reach Srisailam around 01:00 pm.
*My advise is for you if you taking TSRTC bus then please opt for "Super Luxury" not "Express" bus service.
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more... Jai Sri Mallikarjuna Swamy !!!