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• Circumstances Permitting Relief of Rear-End Flag Protection
• One Train Following Another at Restricted Speed
• Use of Radio Communication between Trains to Afford Relief of
Rear-End Flag Protection in Non-Signaled Territory
• Accessibility of Radios for Roadway Workers
• Definition of Control Center
• Definition of Working Radio
• Radio and Wireless Communication Coverage
• Explanation of the term Switching Operations
• Clarification of Communications Redundancy