What effect does an automatic application have on the overall train brake pressure?

An automatic application of the brakes serves to enhance overall brake pressure throughout the train's air brake system. When the brakes are applied automatically, typically due to an emergency situation or a deliberate act to slow down the train, the air pressure supplied to the brake cylinders increases, effectively improving the braking force applied to all cars in the train.

This simultaneous increase in brake pressure across the system ensures that all the cars respond uniformly to the braking command, which is crucial for maintaining control and stability during a stop. It also helps prevent situations where some cars might experience a lag in brake application, which could lead to uneven forces and potential derailments.

While there are various dynamics in play within the whole air brake system, the principle remains that an automatic application uniformly raises the total brake pressure, allowing for effective train handling and safety during operations.