Because of the krishna express in
1.Chennai - vijayawada janashatabdi is enrouted via new Guntur. Slightly obstacle to Janashatabdi in both directions
2. Secunderabad - Guntur SF ICE is getting delayed since first preference is given to Krishna
3. Narsapur - Nagersol / Sirpur inercity slightly getting affected.
Now...
more... the TT of krishna good but speed up should be there for this train and even if timings adjusted slightly 1 hr early in ADB-TPTY route and 1 hr late in return will give extra time for PM for this train. So that it wont get affect on nextday schedule