A 15-year-old boy was killed while surfing on a train car on Staten Island Wednesday afternoon, police said.

The teen was hit in the head by an unknown object and found unconscious on top of the Staten Island Railway car at the Eltingville stop around 1:15 p.m., according to cops.

EMS rushed the teen to Staten Island University Hospital North in critical condition but he did not survive, cops said.

MTA officials have repeatedly urged people not to ride on top of trains in the wake of several teens being severely injured or killed as part of the dangerous trends that was in part driven by social media last summer.