Feb 7, 2013 10:22 AM by ASSOCIATED PRESS
SAN FRANCISCO (AP) - San Francisco transit officials say an alarm that is supposed to alert authorities to obstructions on the city's cable car line did not sound before a cable car hit a metal object and came to a sudden stop, injuring seven people.
The mishap occurred on Wednesday morning as the car was heading downhill around 9 miles per hour. San Francisco Municipal Transportation Agency Director of Transit John Haley says the car hit a 1 and ½ inch screw or bolt in the cable groove and abruptly stopped.
Haley tells the San Francisco Chronicle (http://bit.ly/XS6e1S) that pieces of paper in the past have set off the system's alarms, so it's not clear why the metal object didn't do so.
Five of the injured were taken to a hospital, one of them with life-threatening injuries.
Information from: San Francisco Chronicle, http://www.sfgate.com
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