 The 2012 Alameda County ballot Measure B1 would have restored to the Dumbarton Rail Corridor project through a sales tax increase in Alameda County.Measure B1 failed to pass by a small margin, and a later study showed the measure's failure may have been due in part to the lack of a "sunset" clause for the expiration of the sales tax increase.Two years later, Alameda County voters passed Measure BB, which was nearly identical in language to the 2012 Measure B1, with a few exceptions.