The collision on Friday between the Metrolink commuter train and a Union Pacific freight train was the deadliest rail disaster in the U.S. in 15 years. Metrolink has blamed its engineer for not heeding a red light signal designed to prevent such wrecks.
Federal rail investigators said Monday tests at the crash site showed the signals are working properly and there were no obstructions that may have prevented the engineer from seeing the red light.
The National Transportation and Safety Board said it will now review whether engineer Robert Sanchez was text messaging.
Investigators did not find a cell phone belonging to Sanchez in the wreckage, but two teenage train buffs who befriended him told KCBS-TV that they received a text message from him a minute before the crash.
Metrolink prohibits rail workers from using cell phones on the job, but there is no existing federal regulation regarding the use of cell phones by railroad employees on the job, Federal Railroad Administration spokesman Steven Kulm said.
NTSB board member Kitty Higgins said her agency issued a subpoena Monday to get the engineer's cell phone records. She said Verizon Wireless has five days to respond to the subpoena request.
As NTSB experts prepared to conduct a simulated crash test on Tuesday, some commuters - many wary and emotional - returned to the rail line on the first day of service after the accident.
Mayor Antonio Villaraigosa tried to reassure them the trains are safe.
"I want to dispel any fears about taking the train," he said. "Safety has to be our No. 1 concern, and while accidents can and do happen, taking the train is still one of the safest and fastest options for commuters."
About a dozen bouquets were strung the length of the loading platform at the Simi Valley station as passengers boarded buses and were shuttled to the Chatsworth station, bypassing the tracks still being cleared of wreckage.
Regular commuters said the train load was much lighter than usual.
Higgins said she expects all rail service to be restored by Tuesday afternoon.
The NTSB said the commuter train, which carried 220 people, rolled past stop signals at 42 mph and forced its way onto a track where a Union Pacific freight was barreling toward it. Higgins said the commuter train engineer, who was among the 25 dead, had failed to stop at the final red signal. The crash also injured 138 people.
The collision occurred at a curve in the track just short of where a 500-foot-long tunnel separates the San Fernando Valley neighborhood of Chatsworth from Simi Valley in Ventura County.
Jerry Romero, who normally takes the Metrolink home but skipped it Friday to pick up a bicycle, said he was disturbed by texting reports.
"That would be pretty disturbing in respect to what we're going through as a society, this fascination we have with gizmos," he said.
In 2003, the NTSB recommended that the Federal Railroad Administration regulate the use of cell phones by railroad employees on duty after finding that a coal train engineer's phone use contributed to a May 2002 accident in which two freight trains collided head-on near Clarendon, Texas. The coal train engineer was killed and the conductor and engineer of the other train were critically injured.
The California Legislature last month sent Gov. Arnold Schwarzenegger a bill that would outlaw texting while driving.
According to the Governors' Highway Safety Association, four states have banned texting while driving - Alaska, Minnesota, New Jersey and Washington - and similar laws are under consideration in 16 other states.
Audio recordings of contact between Sanchez and the conductor on Metrolink 111 show they were regularly communicating verbal safety checks about signals along the track until a period of radio silence as the train passed the final two signals before the wreck.
The tapes captured Sanchez confirming a flashing yellow light before pulling out of the Chatsworth station.
The train may have entered a dead zone where the recording was interrupted. Investigators tried to interview the conductor about the lapse Monday, but he declined because a company representative was not able to be present, Higgins said. He is still hospitalized with serious injuries.
A computer indicated the last signal before the collision displayed a red light, and experts tested the signals Monday and determined they were working properly.
On Tuesday they planned to take actual Metrolink and Union Pacific trains to recreate the events leading up to the accident and to test the signals further.
Higgins said the weight of the trains on the track and the sight distance between the two trains will help experts collect more data.
Investigators planned to back the trains away from the point of impact to determine the point at which the engineers could no longer see each other.
"It's really a process of elimination," Higgins said. "That's why we're out testing the signals. We're looking at the track, we're examining the equipment, we're looking at what issues that might have been with the engineer and the other crew members."
