SAN FRANCISCO, May 20 (Xinhua) -- Two cars of a transit train derailed near a station south of San Francisco Saturday afternoon, apparently without causing any injury to passengers.
The Bay Area Rapid Transit (BART) train had nine cars at the time, according to a posting by the regional transit authority on its Twitter social media account, adding that "everybody has been safely off boarded."
It took place near the BART station in Daly City, the largest city in San Mateo County located immediately south of San Francisco.
A BART spokesman told local KCBS radio station an hour after the derailment that the cause of the incident was unknown and the driver would be checked on as part of investigation.
A major delay was expected across the public transportation metro system serving the San Francisco Bay Area in Northern California, including service in the direction of San Francisco International Airport, also known as SFO.
Vowing workers would be trying hard, the spokesman declined to speculate when the service would be back to normal.