There is a line block between PKD and HUP and all trains in this section between noon to around 4pm are delayed last 10 days or so. Line blocks in single line sections are a nightmare and one train or the other have to be sacrificed. One day its KK and the other day its Prashanti exp or BZA passenger. A primary suspect of frequent delays in 12628 last 1 or 2 years is the single line section DD-KWV. Of course thanks to the big slack between KWV and SUR, delay is minimized....