To whom must a Form D be addressed?

A Form D must be addressed to anyone who is expected to execute it, which includes the specific details of the date, location, and any relevant instructions. This approach ensures that all parties involved in the operation, including train crews and dispatchers, are fully informed regarding the authority and restrictions outlined in the Form D. Addressing it in this manner allows for clear communication and compliance with the necessary operational protocols. It is vital for maintaining safety and coordination between different crews and personnel, thus enhancing operational efficiency within the rail network.

The other options do not encompass the necessary breadth of communication required. For instance, addressing it only to specific individuals, such as the Dispatcher and Conductor or the Engineer and Flagman, limits the reach of important information that may need to be accessed by other members of the crew or additional personnel involved in train operations.