During the Locomotive Air Brake Test, what should be done after observing brakes apply on each locomotive?

After observing that the brakes have applied on each locomotive during the Locomotive Air Brake Test, the next logical step is to release the independent brakes. This action is essential because it verifies that the brakes can be released successfully after having been applied. Proper functionality of the braking system hinges on both the application and release of the brakes to ensure operational safety and performance. Once the independent brakes are released, it allows for further testing or to prepare the locomotives for normal operation.

In the context of the test, securing the consist with hand brakes or making another brake pipe reduction is not immediately necessary after verifying the brake application. Checking the air pressure gauges, while important in monitoring the system, does not follow directly as the next step after confirming the brakes have been applied. By releasing the independent brakes, you are engaging in a critical process that ensures the entire brake system is functioning properly and ready for continued safety checks or movement.