True or False: A conductor can inform the engineer of an annulment via the PA system.

The statement that a conductor can inform the engineer of an annulment via the PA system is false. Communication between the conductor and the engineer regarding operational matters like annulments must adhere to established protocols that prioritize clarity and safety. Using the PA system for such important communications is not standard practice, as it might lead to misunderstandings or miscommunication that can impact safety and operational efficiency.

Instead, conductors typically use radio communication or direct methods to relay critical information to the engineer to ensure that messages are conveyed accurately and promptly. This practice helps maintain a clear chain of command and ensures that all operational communications remain confidential and specifically directed. Therefore, the correct answer accurately reflects the operational guidelines in place.