A summary was posted on the NTSB's web site this afternoon: [
ntsb.gov]
From the report:
"
PROBABLE CAUSE
The National Transportation Safety Board determines that the probable cause of the September 12, 2008, collision of a Metrolink commuter train and a Union Pacific freight train was the failure of the Metrolink engineer to observe and appropriately respond to the red signal aspect at Control Point Topanga because he was engaged in prohibited use of a wireless device, specifically text messaging, that distracted him from his duties. Contributing to the accident was the lack of a positive train control system that would have stopped the Metrolink train short of the red signal and thus prevented the collision."
The complete report will be posted on their web site at a later date.