What action should be taken when a signal indicates a "Stop and call"?

When a signal indicates "Stop and call," the appropriate action is to stop the train immediately and establish communication. This directive usually indicates that there is an important situation requiring further information or instructions from the control center or dispatcher before proceeding. By stopping, train operators can ensure safety and compliance with operational protocols, as there may be a hazard or a need for additional guidance regarding track conditions, other train movements, or potential obstacles ahead.

Taking this action reflects the importance of communication in rail operations, ensuring that operators are fully informed before making any further movement. This step is critical for maintaining safety standards and ensuring the well-being of passengers and crew, as well as the integrity of the rail system overall.

While other responses may suggest various actions, none align with the necessity to pause and verify information, which is fundamental in a railway environment where informed decisions are vital to safe operations.