Through Laila Kearney SAN FRANCISCO (Reuters) – Unions representing transit employees within the San Francisco area agreed on Sunday night to postpone for 24 hours a planned walkout that might cripple a rail device serving four hundred,000 riders a day. More than 2,000 drivers and different workers at Bay House Speedy Transit (BART) have been working with out a contract on the grounds that June 30 and two unions representing them had said they might stroll off the job at nighttime on Sunday if no deal used to be reached. …