In which situation is blue signal protection essential?

Blue signal protection is essential when performing equipment repairs because it is a critical safety measure that ensures the protection of workers who are directly engaged in maintenance activities. When blue signals are displayed, they indicate that equipment is being serviced and that no movement should occur in that area. This helps protect repair personnel from the potential dangers associated with moving trains or equipment that could unintentionally interfere with the repair process.

In situations such as transferring passengers, testing signal operations, or conducting routine inspections, while safety precautions are certainly important, the specific requirement for blue signals is particularly tied to the hands-on nature of performing repairs. In this context, blue signals act as a clear and effective means of communication that alerts everyone in the vicinity to the presence of workers and the need to halt any equipment movement, thereby minimizing the risk of accidents or injuries.