What follows a full service brake pipe reduction when the automatic brake is applied?

When a full service brake pipe reduction occurs following the application of the automatic brake, the appropriate action is to control the release of brake pressure. This step is essential for ensuring that the brakes function effectively and maintain control over the train's stopping capability.

Controlling the release means carefully managing how quickly or slowly the brake pressure decreases once the automatic brake is applied, allowing for a gradual and predictable response from the braking system. Proper release control is crucial for the stability and safety of the train, preventing abrupt changes that could lead to loss of control or jerky movements.

In the context of train operations, this involves coordinating with the braking system to adjust pressures in a manner that aligns with operational procedures and safety protocols, ensuring that the braking process is smooth and manageable for both the train crew and passengers.