What does a “Clear” signal indicate to the engineer?

A “Clear” signal indicates that the track ahead is unobstructed, allowing the train to proceed at full speed without the need for any immediate restrictions or caution. This signal communicates to the engineer that it is safe to continue on the current course, enabling efficient travel and maintaining schedule adherence.

The context of the other choices sheds light on why they do not align with the meaning of a “Clear” signal. For instance, indications to reduce speed or prepare to stop would directly contradict the intention of a “Clear” signal, which is to ensure unreserved passage. Therefore, when a locomotive engineer sees a “Clear” signal, they can confidently operate the train at full speed, optimizing both safety and performance on the rail network.