Update 6 p.m.: BART says everyone should expect normal service by 6:30 p.m. Montgomery Street station is back open after being closed for an hour. Authorities were able to uncouple the train and "extract the person from the tracks." The person has been taken to a local hospital, says Luna Salaver, spokeswoman for BART. "Thankfully, this person is still alive," she says.
Update 5:51 p.m.: BART says the Montgomery BART station is open again and service is being restores. The person has been transportation to the hospital, but their condition is not yet know.
Update 5:15 p.m.: BART spokeswoman Luna Salaver says a person was found under the train at about 4:49 p.m. At this time, BART is running eastbound trains, but they are not stopping at the Montgomery street station. That station is currently closed to all passengers. All westbound trains are experiencing major delays systemwide.
"We don't know the condition of the person or the age or why the person was in the tracks," Salaver says.
Original Story 5:03 p.m. BART is reporting the Montgomery Street station is closed due to a "major medical emergency."
There are very few details at this point, but the closure is creating major delays along the Daly City line in the SFO, Millbrae, Daly City and East Bay directions.
Check back for details.