A strange thing happened when I was traveling by this train on 31st Dec'16. It was delayed and left Patna around 10 PM. This train and 12301 entered MGS same time. 12309 was allowed to leave MGS first. At outer signal after leaving MGS, it first stopped and started moving slowly in reverse direction :). I thought It will again go back to MGS. As it was rolling back, 12301 passed on side track and overtook. It continued going back and I thought 12313 would also overtake. Then It stopped going back and after sometime it started again its journey towards NDLS. It reached NDLS after 12301 but ahead of 12313.