What should be done with Form D's that have been fulfilled or canceled?

The correct procedure for handling fulfilled or canceled Form D's is to mark them with an "X" and retain them for inspection. This ensures that there is a clear record of the Form D's that have been processed and provides a way to maintain accountability and transparency in operations. By marking them appropriately, it allows for easy identification and review during inspections or audits. Retaining these forms plays a crucial role in maintaining operational integrity and compliance with regulatory standards.

In this context, discarding them immediately would eliminate important documentation that could be necessary for future reference or regulatory review. Retaining them for only 10 days or filing them indefinitely without further action would not align with the prescribed protocols for documentation management. Proper documentation procedures are vital in ensuring safety and operational efficiency in rail operations.