How should the Dispatcher inform a crew member to reverse a train?

The most effective method for a Dispatcher to inform a crew member to reverse a train is by providing verbal permission and specifying the location. This approach allows for immediate communication, ensuring that the crew member understands the authority being granted and the specific location where the maneuver is to occur. Verbal communication in this context is critical as it provides an opportunity for the crew member to ask questions, clarify any doubts, and confirm understanding, which helps to enhance safety and operational efficiency.

In rail operations, timely and clear communication is vital, especially when it involves critical maneuvers like reversing a train. By specifying the location, the Dispatcher ensures that the crew knows exactly where the action is expected to take place, reducing the risk of confusion or operational errors.

The other options lack the immediacy or clarity required for safe operations. Written documentation alone might not be received in time for the crew to act, and while emails can provide a record, they do not facilitate real-time communication. Lastly, stating that no additional communication is necessary would be unsafe, as it disregards the importance of explicit directives in railway operations.