SAN FRANCISCO (KCBS) -- Investigators say one of the MUNI rail cars involved in a crash Saturday afternoon was speeding and the driver may have been talking on his cell phone.
Sixteen people were injured after a T-Third train rear-ended an N-Judah train near the AT&T ballpark.
Both drivers were hurt and both trains were damaged.
A speed recording device on board the trailing train shows it was going 17 miles per hour in a 3 mph zone just before the crash.
San Francisco Police Captain David Lazar said that the driver reported the train surged forward as he was preparing to stop.
Nathaniel Ford, head of the Municipal Transportation Agency (MTA), says they have determined that the rear-train did not slow down.
Video from an on-board camera on the trailing train also shows the driver exiting the cab with a cell phone in his hand. It is not known if he was talking on the phone before the crash or if he pulled it out to call for help. Normally, operators communicate with central control over a radio.
MUNI says drivers are not allowed to talk on the phone while operating a vehicle. Investigators are trying to obtain the operator's cell phone records.
The operators of both trains have been tested for drugs and alcohol and have been relieved from driving duties until the investigation is complete.