Written authorities that are no longer in effect must be retained until when?

• A. End Of Calendar Day
• B. The End Of Tour Of Duty, Unless Otherwise Instructed By The Train Dispatcher
• C. 24 Hours
• D. Next Shift

Answer: (B)

The main idea is the retention period for written authorities once they’re no longer in effect. They must be kept until the end of the tour of duty, unless the Train Dispatcher tells you otherwise. This creates a complete, auditable record of what was authorized and what was canceled during the entire duty period. Keeping them only to the end of a calendar day, or a fixed 24-hour window, or until the next shift can break the trail when shifts span days or when the duty period extends beyond a calendar day. The dispatcher can override this instruction if safety or operational needs require longer retention, but absent such instruction, end of the tour of duty is the standard baseline.