What is the purpose of the equalizing reservoir in a brake system?

The equalizing reservoir in a brake system plays a crucial role by storing compressed air that is used for braking. This reservoir ensures that there is a steady supply of air available, which is essential for the effective operation of the pneumatic brake system. When the engineer initiates a brake application, air is drawn from the equalizing reservoir to create the necessary pressure in the brake cylinders, allowing the brakes to engage smoothly and effectively.

This function of storing compressed air helps maintain consistent braking performance, particularly during changes in speed and when multiple cars are involved in a train. The equalizing reservoir also helps in managing the pressure throughout the braking system, allowing for adjustments and balance necessary to prevent issues such as uneven braking or excessive brake wear.

Maintaining an adequate volume of compressed air within the system mitigates the risk of brake failure due to insufficient pressure, which could occur if air was only drawn from the main reservoir without the support of the equalizing reservoir. Hence, the primary purpose of the equalizing reservoir is indeed to store compressed air for braking, essential for ensuring safe and reliable train operation.