When must a CSX employee carry a copy of the CSX Operating Manual?

Answer: C — When on duty

A CSX employee must carry a copy of the CSX Operating Manual when on duty to ensure access to vital operational procedures, safety protocols, and regulations that govern the conduct of railroad activities. This requirement emphasizes the importance of having critical references readily available while performing job duties, which can encompass a variety of tasks that might not always be in a regulated environment like operating trains or performing maintenance. While the other scenarios may involve adherence to CSX policies, carrying the manual specifically during all on-duty hours guarantees that employees have the guidelines at hand, which is crucial for maintaining safety and compliance. By having the manual accessible, employees can reference it to clarify any uncertainties that may arise during operations, thus promoting both efficiency and safety in their roles.