Metrolink Train Crash

Fire and rescue officials inspect the wreckage of two derailed Metrolink cars after two trains collided in Glendale at the start of the Wednesday rush hour.  (Brendan McDermid / EPA)

Investigators examine the wreckage from the collision of two Metrolink commuter trains in Glendale. One train struck a vehicle that was parked on the tracks, derailed and sideswiped the other train. Several people were killed and more than 100 injured, authorities said.  (Ric Francis / AP)

A Los Angeles fireman walks near a Union Pacific freight car that was hit after two Metrolink commuter trains collided and derailed in Glendale.  (Brendan McDermid / EPA)

Paramedics give first aid to an injured man near the wreckage of two Metrolink trains that collided in Glendale at the start of the morning rush hour. Several people were killed and more than 100 injured.  (Hector Mata AFP / Getty Images)

Amtrak officials walk alongside Metrolink commuter train cars involved in a collision and derailment in Glendale that left several people dead and more than 100 injured during the morning rush hour.  (Brendan McDermid / EPA)

A firefighter inspects the wreckage of two Metrolink commuter trains that collided and derailed in Glendale after one of the trains struck a car parked on the tracks. Several people were killed and more than 100 injured.  (Hector Mata AFP/Getty Images)

Firefighters survey the site of the collision between two Metrolink commuer trains in Glendale at the start of the morning rush hour. The collision occurred after one train struck a car parked on the tracks, derailed and struck the oncoming train. Several people were killed and more than 100 injured.  (Phil McCarten / AP)

Firefighters inspect the wreckage of two trains that collided in Los Angeles on Jan. 26.  (Hector Mata/AFP/Getty Images)

A firefighter inspects the wreckage of two trains that collided in Los Angeles on Jan. 26.  (Hector Mata/AFP/Getty Images)

Paramedics give first aid to an injured man near where two trains collided in Los Angeles on Jan. 26.  (Hector Mata/AFP/Getty Images)

Paramedics evacuate the injured near the wreckage of where two trains collided in Los Angeles on Jan. 26.  (Hector Mata/AFP/Getty Images)

A firefighter inspects the wreckage of two trains that collided in Los Angeles on Jan. 26.  (Hector Mata/AFP/Getty Images)

Firefighters inspect the wreckage of two trains that collided in Los Angeles on Jan. 26.  (Hector Mata/AFP/Getty Images)

Emergency personnel attend to an injured victim following a commuter train accident in Glendale, Calif. on Jan. 26.  (AP/Nick Ut)