What action can a train operator take to request a correct route at a stop signal?

To request a correct route at a stop signal, the most effective action a train operator can take is to press the button for the desired route. This option is designed specifically for train operators to communicate their routing needs directly to the signaling system or control panel, ensuring that the correct route is activated safely and promptly.

This mechanism is usually part of the signaling system in place that allows train operators to request adjustments to their route. When the operator presses the button, it sends a signal to the control center or signaling system that prompts the necessary changes in route assignment.

While other options may involve communication or signaling to indicate a need for change, they don't typically facilitate the immediate and safe adjustment of the route in the way that pressing the designated button does. Using the button minimizes confusion and directly interfaces with the technology designed for this purpose.