They could probably start a train from CNB at night which arrives at LJN at exact midnight [when the station has platforms empty], undergo Loco Reversal, then blast it's way towards DDN. That way it'll follow all the trains ahead of it like LKO Mail, LKO - CDG Express and reach DDN during late morning hours.
please wait...Translate to HindiWo log shayad CNB se raat mein ek train shuru kar sakte hain jo LJN pe bilkul aadh raat ko pahuche, Loco Reverse kare, aur phir DDN ki taraf chala jaaye. Is tarah woh LKO Mail, LKO-CDG Express jaisi sabhi trainon ko follow karega aur DDN pe subah der se pahuchega.