A witness had reported hearing "a loud snapping sound" and seeing the bus hurtling across the tracks as the crossing arm flew through the air and landed on the tracks at Oak Grove Avenue.
Ms. Dunn said a video recording from a camera mounted on the bus showed that it did not crash through the crossing arm. The lights were flashing as the bus entered the crossing and the gate was up, but as the bus continued, the gate came down on the roof of the bus, toward the rear, and broke away on impact as it is designed to do, she said.
The driver, an employee of the transit agency for more than 10 years, continues to be employed by SamTrans, Ms. Dunn said. Disciplinary action, if any, would be a confidential personnel matter, the agency said.
California' vehicle code requires drivers to stop buses between 15 and 50 feet from a railroad crossing and listen for approaching trains before proceeding across the tracks. If gates are down, drivers must wait until the arms rise and warning bells stop ringing, according to SamTrans policy.
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