What is the whistle signal used to apply brakes or stop the train?

The whistle signal used to apply brakes or stop the train is one long blast. This signal is a standardized communication method within rail operations, ensuring that all train personnel are on the same page regarding the train's status and intentions.

When the engineer uses one long whistle blast, it serves as a clear and concise alert that the train is stopping or that brakes are being applied. This is crucial for maintaining safety and awareness on the tracks, as it signals to other crew members, as well as nearby workers and signals, the intention to halt the train's movement.

This signaling method helps maintain orderly operations and ensures that all actions being taken can be understood promptly by those involved in train operations. Knowing and correctly using these whistle signals is a fundamental part of train engineer training and recertification.