Red.
Please adjust the rake composition. No need of so long rake. Instead 7 3rd a.c , 3 2nd a.c and a single 1st a.c would be enough.
Also you need to alter the departure timing. From 18:45-20:00hr at NDLS, not even a single pf will be vacant. All the pf would be filled up with trains like 12560, 18216 , 12045 , 12920 , 12260 , 12554 , 12958 & 12402.