When approaching the next signal under Terminal Approach, what must a train be prepared to do?

When approaching the next signal under Terminal Approach, the train must be prepared to stop. This is crucial because the Terminal Approach is a signal indication that warns the engineer that the next signal may require a stop or a more cautious approach. It signifies that the train should be ready for a potential stop due to the upcoming conditions at the signal, such as the possibility of a red signal indicating that the train must halt.

By understanding that stopping might be necessary, the engineer can ensure that the train is operated safely and in accordance with railway regulations. This proactive approach helps in maintaining safety protocols and allows for better management of the train's speed as it approaches other signals. The other choices imply actions that could lead to unsafe conditions, as they do not account for the need to stop or reduce speed when approaching a signal that indicates a cautionary measure.