Who is in charge while the air brake test is being conducted?

Answer: B — The Employee performing the test

During an air brake test, the employee performing the test is directly responsible for overseeing and executing the procedure. This individual is specifically trained to conduct the test and ensure that all safety protocols are followed. They are equipped with the necessary knowledge to properly assess the functionality of the air brake system, which is crucial for the safety of the train and its operation. This role requires a thorough understanding of how air brakes work, as well as the various checks that need to be performed to confirm that the system is operating effectively. Their responsibility includes monitoring the gauges, making necessary adjustments, and ensuring that the brakes respond appropriately during testing. The presence and actions of the trained employee are vital in preventing any potential malfunctions that could arise from inadequate testing or oversight.