I posted a Grievance in PG PORTAL, Regarding 15 min Delay Departure of 12017 from NDLS. for giving Connectivity with 12615 Passengers.
I Got Reply From Northern Railway Operating Section.
it is very difficult to provide connection of trains at new delhi station due to non availability of platform as the number of trains dealt are very large. 12615 G.T. exp arrives 0620 hrs and 12017 leaves at 0650 having 30 mts connection time at new delhi.