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

The brake pipe's primary function in an air brake system is to transport compressed air to the brake cylinders. When the engineer applies the brakes, air is released from the brake pipe, creating a pressure differential that allows the braking mechanism to engage. This transfer of compressed air is essential for activating the brakes on each car in the train, providing a coordinated and effective means to slow down or stop the train safely.

The design of the air brake system relies on this function, as it enables a quick response across multiple cars, ensuring that all brakes are applied simultaneously or as needed. This not only enhances stopping power but also aids in maintaining control over the entire train during braking maneuvers.