What does a yellow zone on the parking brake reset gauge indicate?

The yellow zone on the parking brake reset gauge signifies that there is sufficient air supply to activate the parking brakes. This is crucial for ensuring that the system functions correctly when the brakes are engaged. The indication that there is enough air supply assures the train engineer that the brakes can be safely applied and released when necessary, which is vital for both safety and operational efficiency.

In situations where the gauge shows a yellow zone, the engineer can be confident that the system is working well and that the brakes will respond appropriately when needed. Understanding this is important for maintaining safe operations and avoiding potential incidents related to braking issues.