Which are the four documents that are considered Mandatory Directives?

• A. Track Authority, GBO, (PSS) Past Stop signal and EMT Enter Main Track
• B. Track Authority, GBO, PSS Past Stop Signal and Enter Main Track
• C. Track Authority, GBO, (PSS) Past Stop signal and (EMT) Enter Main Track
• D. Track Authority, GBO, Past Stop Signal and EMT Enter Main Track

Answer: (A)

Mandatory Directives are the official instructions that must be followed to govern train movement and safety actions in a controlled area. The four documents that fit this category are Track Authority, GBO, PSS Past Stop Signal, and EMT Enter Main Track. Track Authority provides the formal permission to occupy or move on a specific track or route. GBO, or General Bulletin Order, communicates safety and operating requirements that apply across a broader scope. PSS Past Stop Signal directs crews on what actions to take if a stop signal is encountered or passed, ensuring a safe, predefined response. EMT Enter Main Track gives explicit permission to move from a yard or siding onto the main track. Because each of these documents directly authorizes or prescribes necessary actions to move safely, they are classified as Mandatory Directives.