What is the required action after changing motive power on a train?

After changing motive power on a train, it is essential to conduct a brake test. This action is crucial because the new locomotive may have different braking characteristics compared to the previous one. Ensuring that the brakes are functioning correctly and are effectively integrated into the train's operations is vital for safety. The brake test verifies that the brake system is operational, maintains the required stopping distances, and is in compliance with safety regulations.

While notifying passengers, inspecting cargo, and refueling the engine may be important tasks in the overall operation of the train, they are not the immediate priority following a change of motive power. The integrity of the braking system is paramount when it comes to the safety of the train and its passengers, which is why conducting the brake test takes precedence.