What should a train operator do if the train does not roll freely during a brake test?

If a train does not roll freely during a brake test, the appropriate action is to stop the test and have the conductor check the handbrakes. This response is crucial because a train should have no restrictions that impede its movement when the brakes are released; otherwise, it indicates a potential issue that must be addressed before continuing.

Checking the handbrakes helps ensure that none are inadvertently engaged or malfunctioning, which could compromise the safety and function of the train during operation. It's essential for maintaining proper train handling and safety protocols. Acting on this prevents further complications that could arise from a brake issue, ensuring that all systems are functioning correctly before proceeding.

Other responses do not adequately address the issue at hand. Continuing with the test could lead to significant safety hazards, as a train that doesn't roll freely might be at risk for malfunction or accidents. Applying more power is not a solution to a problem involving brake functionality, as it could exacerbate the situation. Lastly, simply inspecting for obstructions, while potentially helpful, is not as directly relevant as the need to check the handbrakes specifically. Thus, having the conductor check the handbrakes is the most logical and safe course of action.