Completely agree.They can start a DBB KOAA Tri weekly Exp on the lines of a KOAA HDB Tri weekly exp.That can run via TFG,GKG,NCB,NCBD,NMZ[Reversal],SGUJ,NJP,MLDT,NFK,BDC,Naihati.Can use the HWH NJP AC Exp rake and extend it to DBB as well with change in timings.That will do as well with alternate days od run from HWH and DBB