Before changing ends at a terminal, what must a train operator do regarding the brake pipe?

Before changing ends at a terminal, the train operator must ensure the safety and functionality of the braking system. Making a brake pipe reduction of full emergency is essential as it vents the brake pipe, which allows the brakes to apply fully. This action ensures that all car brakes are engaged and ready to hold the train securely in position.

This process is vital for maintaining safety during the terminal operations, as it prevents any unintended movement of the train while the operator is changing ends. By creating a full emergency brake application, the operator guarantees that the air pressure in the brake line is reduced, which triggers the brakes across the entire train. This precaution mitigates the risk of accidents or mishaps during the transition.

Other options involve actions that do not adequately ensure the proper application of the brakes or do not specifically address the readiness of the train for stable operations during an end change. Conducting a partial brake check, for instance, may not fully prepare all cars for a secure standing position. Similar reasoning applies to releasing all brakes or switching to manual control, which do not provide the necessary safety measures required before changing ends.