Service on the Montauk LIRR branch has been fully restored after a train hit and killed a man Friday in Great River, authorities said.

He was at the Great River station when he was struck at 4:45 p.m. by a westbound Long Island Rail Road equipment train, said Salvatore Arena, a spokesman for the Metropolitan Transportation Authority.

advertisement | advertise on newsday

"He either slipped or jumped from the platform," Arena said.

Service was restored in both directions shortly before 7:45 p.m., LIRR said, but officials warned riders of residual delays of up to 30 minutes.

It was not clear how fast the train was going, Arena said. Because it was not carrying passengers, the service train could have been going near the maximum speed allowed there, Arena said. He did not immediately have the speed limit for the area.

Other details about the accident were not immediately available Friday night.