It happened just after midnight, Friday night, and a large section of the SkyTrain station remained closed behind police tape for several hours. Blood could be seen all over ground just outside the fair-paid zone.
Police said the victim was taken to hospital, and is now in stable condition.
NWPD said an initial investigation led its members to an address in New Westminster where four people were arrested.
Police say the public is not at risk, and their investigation continues.