What defines "disturbed track"?

The correct choice is a section with a temporary speed restriction. "Disturbed track" refers to any track that is not in its normal operating condition and where speed restrictions are applied to ensure safety. This may occur due to a variety of factors, such as track maintenance, repairs, or unforeseen conditions that could impact the integrity of the track. When a temporary speed restriction is in place, it indicates that caution must be exercised when operating on that section to prevent accidents or further damage.

In contrast, while a section of track with debris may pose hazards, it does not inherently define disturbed track unless speed restrictions are applied. Similarly, a section undergoing maintenance indicates that work is in progress, but the specific definition of disturbed track is tied directly to the speed limitations. Lastly, a section of track that is permanently closed is not considered disturbed in the same way because it signifies a permanent state rather than a temporary condition requiring reduced speed. Thus, the definition of disturbed track most accurately aligns with a section having a temporary speed restriction.