I just got nostalgic seeing your trip. I have travelled numerous times on HWH/SDAH/BBS/PNBE-MGS-NDLS reaching MGS at late night. Till date I have never crossed MGS without de-boarding the train and taking next train next day at best. Even though in pre-planned travel to NDLS, I always de-boarded at MGS (last minute plan change , few seconds before the train reaching MGS) and went to NDLS next day or few days later.