Jim HerdA handful of trial attorneys with years of experience litigating against public transportation agencies, train systems, and Muni told SF Weekly that elements of this weekend's West Portal train collision could come together to form a legal perfect storm that drains many millions of dollars from the city's coffers. On Monday, SF Weekly broke the story that the Muni drivers' union claims train operators routinely flouted safety rules in the subterranean tunnels by switching off the automat