As per me,its the best train to travel from secunderabad to odisha/kolkata.
Personally many times travelled in this train. From secunderabad to vijayawada,its good speed,punctual and no unauthorized entry. After BZA,some local travellers bound to inbetween stations of BZA-VSKP board the train but here SCR TTE are very strict to this and they don't allow to board them in sleeper classes. So till morning i.e berhampur,its all neat,clean and happy journey. But after that,the journey till BBS sucks. Train is bit slow and unauthorized pax board it to go BBS/CTC. TTE also don't even ask anything. After BBS/CTC,again this train shows its full aggresion. If falaknuma exp gets late by 20-25 min at BHC,then hold your breath for a deadly aggresive overtake...
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of falaknuma by the ECoR king BBS rajdhani before balasore,somewhere at khantapara or soro-a great video to shoot.

Cleanliness is ULTIMATE.
I would say BEST. All dry and neat & clean when the train came to Pf 1 of SC.
My coach was S2 which was near to Loco. My Seat was in RAC. From SC to BZA , its all excellent. Very perfect coach. No extra crowd (bcoz all BZA bound unreserved & daily MST holders take the Satavahana Express).
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BZA , lots of Unreserved and Waiting ticket holders board this train. it becomes very packed near the doors, but here also TC comes to it duty (quite good to see) and pushes all General ticket holders to Unreserved compartments (PRS Waiting Ticket holders are allowed to travel in SL).
That night also the cleanliness is same as it is and water is present at every toilets and basins of SL class.
Next morning , cleaning is done at VSKP. After that , from VZM to KUR , its a HELL journey in SL. Full of beggars , unreserved travellers standing at doors and blocking the way to toilets. Continuous disturbances due to Transgenders extorting money from us and NO TC present. The toilets and basins were soon clogged due to Paan spit and plastic garbage. Its a pain if you don't wake up early next morning and relieve yourself ASAP. This all pathetic scene ended when train reached KUR. Train became empty and a cleaning staff cleaned the basins and toilets (seems like someone complaint on phone regarding cleaning and water clogging). Then the rest of the day journey is good and as the train moves ahead towards Northern Odisha, then coaches becomes to empty. By the time this train reaches KGP , nearly 50-60% seats in SL were empty.