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.

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.