Northbound train No. 313 hit the person around 7:50 a.m. just south of the 22nd Street station in San Francisco, Caltrain officials said.
No injuries were reported among the roughly 500 people aboard the train. Trains are stopped in both directions near the collision scene, Caltrain officials said.
BART trains are providing aid for customers, who could have delays of up to 30 minutes as a result of the incident, Caltrain officials said.