The rank-and-file members of the nation’s largest rail union, which represents the industry’s conductors, rejected a tentative labor deal with freight railroads, the union announced Monday.The four unions that have voted no will remain on the job until at least early next month while negotiations are held to try to avoid a strike that could cause widespread disruptions in the nation’s still struggling supply chain and overall economy.President Joe Biden called those deals “a win for tens of thousands of rail workers and for their dignity and the dignity of their work.” He had directly intervened in the final round of talks, but his praise of the deals wasn’t enough to win approval from rank-and-file members of the conductors’ union.The no vote follow similar contract rejections by the rank-and-file members of three other rail unions – one representing track maintenance workers, another whose members maintain and operate the signal system, and a third who represent locomotive mechanics and welders.One of those unions which earlier rejected its deal, the Brotherhood of Maintenance of Way Employes Division (BMWED), announced Monday it was moving its strike date back to Dec. 9, to be in sync with the strike date for the conductors and one of the other unions."