CARLSBAD–A female pedestrian Thursday was fatally struck by an Amtrak train while trespassing along the tracks, authorities say.

The collision occurred before 1:30 p.m. along the tracks near the 5800 block of Avenida Encinas. A southbound Amtrak train was going between 70 and 80 miles per hour when the engineer spotted a woman who was trespassing along the tracks. He immediately activated the train’s emergency braking system, but was unable to avoid the collision. The woman who was struck died at the scene.

Investigators say passengers on the train were not hurt.

The Medical Examiner’s Office will notify the woman’s next of kin. Her identity has not been released.

The Sheriff’s Transit Enforcement Unit and Amtrak Police Department are investigating the accident.