Cable Car Barn & Powerhouse         

1201 Mason Street San Francisco, CA 94108 (corner of Mason and Washington Sts.)

As of August, 2004, the museum is open every day of the year with the exception of Thanksgiving, Christmas Day and New Year's Day.

Hours: April 1st - September 30th 10AM - 6PM October 1st - March 31st 10AM - 5PM

http://www.sfcablecar.com/barn.html