Bay Area commuters may see devastating cuts to transit service because Gov. Gavin Newsom is backtracking on a promise to provide a critical $750 million loan to BART, Muni and other regional transit agencies, local lawmakers say.

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Without that funding, the senators say, BART will have to close stations and limit train service on many routes to once an hour. Muni could face a 50% reduction in frequency on many lines. As a result, freeway traffic would balloon, leading to traffic jams and longer car commutes, they say.