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1. Yardmasters
2. Train and Engine Service Employee Tie-ups After Maximum Statutory On-duty Time
3. Bridgetenders
4. Relaying "Orders" between Railroad Employees
5. Flaggers
Also OPSA-96-03
• 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