Before departing from a terminal, what must a train operator receive?

The requirement for a train operator to receive a proceed buzzer signal from the conductor is crucial for ensuring that all safety procedures are adhered to before departure. This signal is typically a communication method indicating that all safety checks have been completed, and it is safe for the train to proceed. It ensures that the crew is in sync and confirms that the train operator can safely start the journey without lingering issues.

Effective communication between the conductor and the train operator is vital for operational safety, which includes confirming readiness to depart. This practice helps mitigate the risk of accidents or mishaps during the train's operation.

While other options may pertain to aspects of train operations, such as receiving signals or notifications, the specific communication of a proceed buzzer signal embodies the direct confirmation necessary for a safe departure.