The Associated Press reports that a federal judge has approved class-action status for workers at two Tyson Foods Inc. plants in Nebraska who are suing their employer over wages. The lawsuits say production workers at the Dakota City and Madison plants are paid only for the time that they''re on the actual assembly line. The workers are seeking pay for time before and after assembly line work -- time spent putting on uniforms and safety gear, sanitizing equipment, sharpening knives and other duties. Tyson says in court filings that workers were paid appropriately. The court filings show one of the class-action lawsuits could include at least 3,100 workers in Dakota City and the other could cover up to 2,000 workers in Madison. Trial dates have not been set.