All train service north of Santa Clara was stopped for several hours after a boy was killed in an incident with an Amtrak train Saturday afternoon, according to police.
Police have not released the exact age of the boy.
"Suffice it to say it was a very young juvenile," said Wahid Kazem, the public information officer for the Santa Clara Police Department.
The accident occurred about 4:19 p.m. along the Union Pacific tracks in Santa Clara. Kazem said it isn't clear as to why the child was on the tracks or how the child got there, but stressed it was an accident and not a deliberate act.
The Santa Clara Police Department and Amtrak are conducting a joint investigation, according to a tweet from Santa Clara Police.
The portion of the track where the incident happened is surrounded by industrial sites with the nearest apartments and homes about a half a mile away. It is unclear how the child ended up on the tracks.
"It's extremely sad that this event happened," Kazem said. "We're looking into how this happened. In regards to who had custody of this minor and how the minor got out of that custodial area and out onto the train tracks."
Trains resumed service just before 9 p.m.