Federal investigators have released more details about Thursday's fiery Caltrain collision in San Bruno that injured 13 people, but the crash's cause remains unclear.
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National Transportation Safety Board investigators offered a simple assessment after their first day surveying the collision site.
"A lot of fire damage, and tremendous impact damage," NTSB Vice Chairman Bruce Landsberg said in San Bruno on Friday.
The southbound 506 train, traveling at 60 miles an hour, struck three vehicles in San Bruno used by a construction working to electrify Caltrain's tracks.
Workers only had moments to escape their vehicles when they saw the train approaching on Thursday morning.
"(The) foreman saw the train coming, and jumped out of the truck and got most of the other workmen out," Landsberg said.
A safety system designed to prevent such collisions was in operation when the accident occurred, leading many to question how Thursday's crash still happened.
"We're wondering what happened, too, and so we hope to find that out," Landsberg said.
Investigators must still hand the site off to Caltrain before the damaged train can be cleared and work can begin to reopen the line, meaning the disruptions to service will continue into the weekend.
Caltrain announced on Friday it will operate under a regular weekend schedule, with a bus bridge between the South San Francisco, San Bruno and Millbrae stations. Pick-up and drop-off information for the bus bridge can be found here.
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