Alameda-Contra Costa Transit District workers are set to walk off the job on Thursday after issuing the 72-hour strike notice Monday. AC Transit buses serve the East Bay and also provide service in and out of San Francisco.
BART is the nation's fifth-largest rail system and AC Transit's buses carry about 100,000 people roundtrip each day. The buses served as alternative transportation for many BART train riders during a nearly five-day strike in July. Both BART's and AC Transit's contracts expired in June. AC Transit workers have since rejected two contract proposals.
BART was running trains on a normal schedule on Tuesday after unions and management agreed to extend labor talks past a midnight Monday deadline.
Federal mediator George Cohen told reporters around 1 a.m. Tuesday that "intense negotiations" would go on through the night. The parties concluded talks around 5:30 a.m. and were set to resume in the afternoon.
"Bargaining has produced some constructive and productive progress," Cohen said.