Under what condition should an emergency brake application be used?

An emergency brake application should be used when the speed exceeds the maximum authorized limit by 5 MPH. This situation indicates a potential safety hazard, as exceeding speed limits can lead to loss of control of the train and increase the risk of accidents. The emergency brake system is designed to bring the train to a rapid halt in critical situations, ensuring the safety of the crew, passengers, and rail infrastructure.

Utilizing the emergency brakes under these conditions is a crucial safety protocol that allows for a prompt response to potentially dangerous situations, ensuring that the train is brought back within safe operating parameters as quickly as possible.