From BZA to NDLS AP express must be given 24--24.5 hrs run which will be faster than TN (26.5 hrs from BZA) but slower than Radhani (22.5 hrs from BZA) as AP is a SF category train with 130 MPS. It'll be a very good if IR make it trail SBC Rajdhani with the gap around 5-10 mins from BPQor NGP. We know 22691 arrives NZM at 5.55AM, So if AP enters NZM around 6.00- 6.10 AM then it can arrive comfortably into NDLS @6.35AM and IR should remove halts between WL and BPQ as TG already covering those stations. But, the problem is they should start AP express in VSKP at 23.00 and it's respective BZA departure must be around 5.00 AM. By giving 110MPS run till BPQ, from BPQ to Lalitpur 120MPS and 130MPS from Lalitpur all the way to Okhla. Here, SBC Raj will have 120MPS...
more... from SC so it'll overtake between BPQ and NGP then AP will trail SBC Rajdhani inheritng its overtakes.
This is my view regarding AP express TT :)