What is Quick Service in the context of air brakes?

Quick Service in the context of air brakes refers to the local venting of the brake pipe air. This action allows for a quicker response in adjusting the brake system's pressure, particularly in situations where rapid changes in braking are necessary. By venting the air locally, it enables the brakes to be released or adjusted more swiftly without the need for a complete system reset, which would be the case if the entire brake pipe were involved.

This method is particularly advantageous when making quick adjustments to brake pressure while maintaining some level of control over the brakes already applied. It is an important technique for train handling, allowing for smoother transitions and reducing the potential for undue strain on the mechanical components of the train. Understanding this function is essential for effectively managing the air brake system and ensuring the safe operation of trains.