Breaking News SAN FRANCISCO — It turns out that last month's MUNI Metro meltdown didn't have to happen, transit officials acknowledged. The massive service interruption that began on the morning of April 26 was triggered by a MUNI train pulling down cable wiring in the subway. Now, MUNI is blaming it all on a defective part that was missed during a routine weekly inspection. "The back of the train ripped down almost 1,000 feet of overhead wire," said MUNI Acting Director Julie Kirschbaum.