UPDATE, 6:20 p.m.: It appears that the fatality was intentional, Caltrain spokeswoman Tasha Bartholomew said.
UPDATE, 4:15 p.m.: Trains are single-tracking at restricted speeds through the area where a person was fatally struck on the tracks in San Mateo this afternoon, according to Caltrain officials.
A commuter train struck and killed a person Tuesday afternoon in San Mateo, according to Caltrain officials.
The incident occurred around 2:35 p.m. on the Caltrain tracks near Bellevue Avenue, Caltrain officials said. The southbound train had about 700 passengers on board at the time.