What is the role of the brake pipe in the air brake system?

The brake pipe is integral to the air brake system, as it serves the crucial function of distributing compressed air throughout the entire train. This distribution allows for the simultaneous operation of brake systems on all cars when a braking command is initiated, ensuring that the entire train can decelerate effectively and uniformly.

By maintaining a consistent supply of compressed air, the brake pipe ensures that each car receives the pressure necessary to activate its brakes when needed. This coordination across the train is vital for safety and efficiency, particularly during emergencies or when a quick stop is required. The brake pipe thus acts as the backbone of the air brake system, enabling the necessary communication and function that keeps the train functioning correctly and safely.