SAN FRANCISCO (CBS/AP) — An alarm that alerts authorities about possible obstructions on San Francisco’s world-famous cable car line didn’t sound off before a cable car hit a bolt and came to an abrupt stop, injuring seven people, transit officials said Thursday.
The alarm didn’t sound because the loose bolt came from a street surface plate that was lodged into the tracks, San Francisco Municipal Transportation Agency spokesman Paul Rose told The Associated Press Thursday. The bolt was above the underground cables that has sensors around it, he said.
Wednesday’s mishap occurred after a cable car with about 40 people onboard going downhill at around 9 miles per hour struck a 1 1/2 inch bolt in the cable groove and came to a sudden halt. Two other cable cars had passed safely through the site about 10 minutes before the accident.