Who is responsible for issuing and canceling circulars, instructions, and notices?

The correct choice is that designated managers are responsible for issuing and canceling circulars, instructions, and notices. This responsibility typically falls under the purview of individuals who are positioned to ensure that the communication is effective and adheres to operational protocols. Designated managers possess the authority and training to evaluate the necessity of such communications, ensuring that operations continue safely and efficiently.

This role is critical because managers have a broader view of the operational needs and can coordinate the dissemination of information across various departments and teams. By managing the flow of these documents, they help maintain compliance with regulations, facilitate communication among employees, and ensure that everyone is informed of any changes that may affect their work or the safety of the railroad operations.

In contrast, all employees, train conductors, and train engineers play important roles in operations but do not typically have the authority or responsibility for issuing or canceling formal communications like circulars and notices. This delineation of responsibilities helps streamline operations and maintain clarity in communication within the railroad system.