What action should be taken when approaching a Terminal Approach signal?

When approaching a Terminal Approach signal, the appropriate action is to slow down and prepare to stop. This signal indicates that the train is nearing a terminal area, where specific operational procedures must be followed, ensuring safety and compliance with any upcoming signal indications or track conditions.

Slowing down enables the engineer to have better control over the train and to react promptly to any subsequent signals that may require stopping. This is particularly important in terminal areas, where trains may need to come to a complete stop for station access, crew changes, or other operational needs.

In contrast, proceeding without stopping or increasing speed would not be advisable as it could lead to unsafe situations, especially if the train encounters a stop signal or an unexpected condition. Stopping immediately might be necessary in some critical situations but is not appropriate for a Terminal Approach signal, where a controlled deceleration is the intended action.