San Francisco transit workers end strike, contract talks continue July 5, 2013 -- Updated 0650 GMT (1450 HKT) Striking transit workers in San Francisco will return to work Friday, but contract negotiations will continue. NEW: BART workers to return to work without a contract (CNN) -- Striking union workers for San Francisco's transit system resume work Friday without a contract while negotiations continue, officials said. "BART workers will return to service without a contract agreement in place," said Marty Morgenstern, the leader of the state Labor and Workforce Development Agency. Both parties have agreed and are putting good faith in the continuing negotiations. Bay Area Rapid Transit is expected to resume services at 3 p.m. local time Friday. The two sides negotiated for hours through high-level mediators appointed by Gov. Jerry Brown. "Tired, frustrated, that's probably the nice way to put it," Bomberger, a 23-year employee, told CNN affiliate KGO. About 400,000 people use the service daily and have been affected since the strike began Monday. BART is the nation's fifth-largest train system in the United States, with 44 stations in 26 cities that make up the Bay Area, according to the transit authority. CNN's Jake Carpenter contributed to this report