What is an advantage of using route request buttons over a whistle?

The advantage of using route request buttons over a whistle lies primarily in their accuracy as a form of communication. When train operators or crew members use route request buttons, they can send specific signals that are clear and defined, allowing for precise interaction. Unlike a whistle, which can be ambiguous and subject to interpretation based on context or circumstances, button signals have predetermined meanings that leave little room for misunderstanding. This clarity is essential in ensuring that all team members understand the exact nature of the request being made, thereby increasing operational efficiency and safety.

While other options present valid considerations—such as the physical effort involved, the ability to operate from a distance, or the visual confirmation provided by buttons—the hallmark feature that stands out in this context is the direct and unambiguous nature of communication facilitated by the buttons. This specificity helps in maintaining effective coordination during train operations.