Which step involves moving the automatic brake valve handle to the RELEASE position?

Moving the automatic brake valve handle to the RELEASE position is an essential part of the brake system's operation when preparing to start or in situations where the brakes must be released after being applied. This step is crucial for allowing the train to move freely by venting the air pressure from the brake cylinders, thus disengaging the brake shoes from the wheels.

In the context of train handling, this action typically comes after ensuring that all safety checks and proper procedures have been followed, such as confirming that the train is secure and all systems are ready for operation. By using the RELEASE position, the engineer ensures that the brakes will not engage unintentionally, allowing for a smooth transition into motion once all other preparations are complete.

Understanding the correct sequence of operations in train braking procedures is vital for safe and effective train handling. This step is specifically placed in its sequence to ensure optimal safety and control throughout the process.