The person who died after being hit by a train near the Martinez Marina Sunday was trespassing on the train tracks when hit by the train, an Amtrak spokeswoman said.
"It was a trespasser, someone on the tracks who should not have been there," said Christina Leeds, a spokeswoman for Amtrak.
Train 733, a Capitol Corridor train, was on its way to Oakland from Sacramento when the strike happened around 11:45 a.m., Leeds said.
The investigation concluded and trains were back on the move around 1 p.m., Leeds said.
The public is asked to use caution in the area, because an investigation of the incident is going on. People should not use Ferry Street to enter the marina, police said.
Instead, people are asked to enter the marina using Berrellesa Street into the sports complex parking lot, police said.
The marina is located at 7 Court Street.
Additional information was not immediately available.