What is the requirement for numbering Form D's issued by the Dispatcher?

The requirement for numbering Form D's issued by the Dispatcher includes the stipulation that the number must be prefixed with the issuing railroad's letter designation. This is important for clear identification and differentiation between various railroads, especially in situations where multiple railroads may be operating in proximity or sharing tracks.

By including a specific prefix for the issuing railroad, it ensures that there is no confusion regarding which railroad has issued a particular Form D. This systemic approach to numbering helps facilitate communication and record-keeping, enhancing safety and operational efficiency. Such thoroughness is crucial in rail operations, where understanding the authority and instructions provided on Form D is essential for safe train movements.