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If that 61 percent rate was representative of a larger sampling, then the employee could have received up to $143,300 in fraudulent overtime out of the $234,928 that was paid during a 30-month period from July 2009 through December 2001.

Meanwhile, management and union supervisors paid little attention to the staggering overtime costs, according to the review. In addition to failing to flag fraudulent overtime and misuse of Amtrak property, supervisors also failed to prevent cost overruns and slow progress in finishing two unidentified projects funded through the federal stimulus program, according to the report.