On the Engineer's Control Stand, what color hand indicates the Main Reservoir on the first gauge?

On the Engineer's Control Stand, what color hand indicates the Main Reservoir on the first gauge?

• A. Red
• B. White
• C. Black
• D. Green

Answer: (A)

Color-coded gauge hands help the engineer identify important readings at a glance. The red hand on the first gauge is used to indicate the Main Reservoir because this is a critical, high-priority system—the reservoir provides the compressed air needed for braking and other essential functions. Keeping the Main Reservoir indication in red on the primary gauge makes it easy to spot quickly, so you can confirm there’s sufficient pressure. The other colors mark different parts of the system, but they aren’t used to signal the Main Reservoir.

Color-coded gauge hands help the engineer identify important readings at a glance. The red hand on the first gauge is used to indicate the Main Reservoir because this is a critical, high-priority system—the reservoir provides the compressed air needed for braking and other essential functions. Keeping the Main Reservoir indication in red on the primary gauge makes it easy to spot quickly, so you can confirm there’s sufficient pressure. The other colors mark different parts of the system, but they aren’t used to signal the Main Reservoir.