SUNNYVALLE (CBS SF) — A person on the tracks was fatally struck early Monday by a Caltrain express train just north of the Sunnyvale Station, triggering system-wide delays, transit officials said.

Caltrain spokeswoman Tasha Bartholomew said a northbound train No. 305 struck the person who was trespassing on the tracks around 6 a.m.

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There were approximately 170 passengers on the train with no reported injuries onboard. All trains stopped in the area after the collision and the southbound track was reopened at restricted speeds shortly before 7 a.m., but major delays lingered through the morning commute.

As of shortly after 8:30 a.m., the tracks in both directions reopened for trains at maximum speeds, Bartholomew said.

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The San Mateo County sheriff’s Transit Police Bureau, which patrols the Caltrain corridor, is investigating the fatality. Bartholomew said it is too early for investigators to determine whether the death was intentional or accidental.

The name of the victim will be released by the Santa Clara County medical examiner’s office.

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It was Caltrain’s 16th fatality of the year compared to 13 in all of 2018.