Seems like third line is being used now a days. I have observed many trains running almost on time or slightly delayed from Balharshah to Kazipet Town. Once the third line gets finished completely trains may do BPQ WL section under 3 hours.
Not sure why but yes TN's priority in BPL-NDLS section is not so great. In the next change of time table im expecting some speed up, but donno whether it will happen.
The time table which we are seeing it is there in icf era too but now its 130 end to end limited stops like rajdhani express i think they can depart tamil nadu at 22:30 in chennai and they can manage for 6 or 6:15 in the morning
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