An Altamont Corridor Express train headed for Stockton derailed and crashed into a creek near Polarmes and Niles Canyon roads in Sunol Monday evening.
At least nine people were injured when the first passenger car overturned and landed in Alameda Creek. The second car also derailed but remained upright.
Fire officials said everyone has been removed from the train and are being assessed.
The Alameda County Fire Department said 5 people had minor injuries and four had serious but non-life threatening injuries. More than 200 people were on the train at the time it crashed. The train reportedly hit a fallen tree that was on the tracks.
Passengers who were not injured will be transported to the Alameda County Fairgrounds by bus.
Niles Canyon is closed while officials investigate the derailment.
ACE said it was the No. 10 train that was derailed. That train's route is from San Jose to Stockton.
ACE announced there will be no service on Tuesday. It's possible service could also be canceled Wednesday.
Stay with FOX40 and FOX40.com for updates on this developing story.