At least one BART union agreed Saturday to put the transit agency's contract proposal to a vote, but commuters looking for a quick end to the 2-day-old strike should hold off on the celebrations. Speaking from the entrance of the shuttered Pittsburg BART Station, Antonette Bryant, president of Amalgamated Transit Union Local 1555, said she expects that vote to result in a "resounding no." ... A spokeswoman from Service Employees International Union Local 1021, BART's largest union, declined to say whether that union also would allow a vote on the contract. ... With no negotiations scheduled, both sides said Saturday...