When securing a train after a separation, which procedure should be followed first?

Notifying the train dispatcher is the correct first action when securing a train after a separation. This step is crucial because the dispatcher needs to be informed of the situation to manage traffic safely and ensure other trains are aware of any potential delays or hazards created by the separation. Effective communication with the dispatcher is integral to maintaining operational safety and efficiency on the rail network.

While the other procedures are important, they typically follow this initial notification. Closing the angle cock prevents air pressure from escaping, inspecting for leaks ensures the integrity of the air brake system, and recharging the air brake system is necessary for reestablishment of braking capability. However, none of these steps can effectively commence without first ensuring that the dispatcher is aware of the change in train status.