What should be done during an electrical failure in a signal system?

During an electrical failure in a signal system, the proper action is to investigate and repair the electrical components involved. This approach ensures that the underlying issues causing the failure are identified and addressed. Investigating allows for a thorough assessment of the system to determine which components may be malfunctioning or damaged. Following this, repairs can be made to restore the system to full functionality, ensuring that it operates safely and effectively.

Immediate replacement of all components, as suggested in one choice, isn't practical or efficient because it might lead to unnecessary costs and does not guarantee that the problem will be resolved. Continuing operations without repairs poses significant risks, such as safety hazards and further system damage, which could lead to larger issues. Calling a tow truck, while it may be appropriate for vehicles malfunctioning on the road, is irrelevant in the context of signal system operation. Instead, a methodical repair process is vital for the integrity and safety of traffic patterns managed by the signal system.