Sir, I have already told that this is not for KOAA- ASN section, this train is for Asn-BKSC-RNC section so that they get a better connectivity with kolkata, that's why more halts r there in that section and less halts in Koaa-Asn section, in fact the train is passing at midnight in that section
Moreover, there are some Short distance trains that skip BWN, for example u can take Coalfield, PNBE Janshatabdi, Koaa GCT exp via Pnbe, Pnbe GR, etc