Onboard Brightline workers have voted 2-1 to join the Transport Workers Union, overcoming opposition from management that urged a contingent of more than 100 employees not to organize, the labor group announced Tuesday. The National Mediation Board in Washington, D.C., disclosed the election outcome Tuesday, after multiple weeks of mail balloting that started in November, the TWU said in a statement. The covered workers include an estimated 100 onboard and “lead” attendants who sell food and beverages on Brightline trains that travel between Miami and Orlando.