Police hunt after man stabbed at Epping train station

Police are hunting for the person who stabbed a man on a train at Epping on Sydney's north shore overnight.

Emergency services were called to Epping station at 11pm following reports a man had been attacked.

The victim was treated at the scene for stab wounds to his beck and chest before being taken to Royal North Shore Hospital in a serious but stable condition.

Police are speaking with witnesses and trying to piece together the moments leading up to the attack.

Anyone with information should call Crime Stoppers on 1800 333 000.