The nation’s top court will not take up a record-breaking railroad injury case from Cook County.The U.S. Supreme Court on Monday declined to hear a railroad’s argument that the $21.4 million verdict for a conductor whose heel was sheared off between two train cars was premised on a misleading jury instruction.According to the Jury Verdict Reporter, a product of Law Bulletin Media, the award is the largest ever given for a heel injury-related settlement or verdict in Cook County.A petition for certiorari filed …