SAN FRANCISCO (KCBS)  -- Two cable cars on the San Francisco Muni’s California Street line crashed into each other Friday morning. No passengers were aboard. The line will be closed for the rest of the day for repairs.

One of the cars was stopped at the routes terminus where California Street interests Drumm Street when some kind of mechanical problem caused the another car to careen into it.

“You could hear it real bad,” an eyewitness told KCBS’s Janice Wright at the scene. “It pushed the other car forward.”

That witness, who works at the shoe shine stand on the corner and indentified himself only as Robert, recounted watching repair crews working on what appeared to be some kind of knot in the underground line that moves the cars.

Two crew members were hurt, said a Muni spokeswoman who did not know the extent of their injuries.

Service on the Powell Street cable car lines that run from San Francisco Center to Fisherman’s Wharf and North Beach should not affected by the crash or the repairs, said a Muni spokeswoman.

Friday’s accident is the second one this summer involving a cable car, and the latest in a string of collisions involving both busses and streetcars.

(jro)