Federal are investigating Thursday morning's fiery crash involving a southbound Caltrain and a contractor's utility truck in San Bruno, and commutes will still be impacted on Friday.
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Caltrain said on Thursday night it is assisting with a National Transportation Safety Board investigation into the crash, which affected service between South San Francisco and Millbrae. The agency said SamTrans would operate a bus bridge between the two stations until at least 4 p.m. on Friday.
The incident happened just past the San Bruno station on the tracks at about 10:36 a.m., according to Caltrain Public Affairs Specialist Dan Lieberman. SB506, the Caltrain route involved in the crash, was evacuated after striking a crane. SB506 is a limited service train that isn't normally scheduled to stop in San Bruno.
A lot of black smoke was visible in the area following the collision.
Of the 75 passengers aboard the train, the agency said 13 people were injured, including two Caltrain employees. Six people were hospitalized with non-life-threatening injuries as of Thursday afternoon, according to Lieberman.
None of their injuries were thought to be serious.


A fire underneath the train was also put out.
Several Twitter users shared pictures and video of the aftermath.
The accident impacted Caltrain service all day Thursday. Northbound trains turned around at the Millbrae station. Any trains heading south from San Francisco turned around at Caltrain's South San Francisco station. SamTrans and BART provided mutual aid to impacted passengers, and hourly trains making every local stop began departing Tamien just after 12:30 p.m.
Several agencies, including the San Bruno Fire Department, remained on the scene into early Thursday afternoon. The truck, which Lieberman said is believed to have been working on the tracks at the time of the collision, came to a rest near San Felipe Avenue and Huntington Avenue. It's not believed to have been crossing the tracks.
"A great deal of work has been going on while service continues," Lieberman told KCBS Radio's Rebecca Corral. "Typically, however, that is ... supposed to be clear when trains are coming through. What exactly happened today is unclear and that's what we're trying to investigate and find out."

Caltrain warned commuters to expect delays until at least 4 p.m. on Friday. Officials told KCBS Radio's David Welch said riders should expect a "difficult" commute because the tracks, where the train remained as of Thursday night, had been damaged.
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