What does a blue signal signify for workman in relation to rolling equipment?

A blue signal is a crucial safety indicator in rail operations, specifically designed to protect workers who are engaged in maintenance or repairs on rolling equipment. When a blue signal is displayed, it signifies that workers are on, under, or between rolling equipment. This signal serves as a warning to operators of any train or engine that may be approaching, indicating that they must not move the equipment in question. This ensures the safety of the maintenance personnel by preventing unexpected movements that could lead to accidents or injuries.

In contrast, the other options do not align with the purpose of a blue signal. For example, preparing for departure or operating the train implies active movement, which runs counter to the safety objective of the blue signal. Taking a break is unrelated as well; the blue signal specifically pertains to situations where workers are in proximity to possibly hazardous rolling equipment, not resting away from it. Understanding the role of signals in maintaining safe work environments is essential for anyone working in rail mechanics or related fields.