If a car is laid up on a yard track with air brakes applied, where would the brake "creep off" most quickly?

When a car is laid up on a yard track with air brakes applied, the brake "creep off" refers to the gradual release or reduction in brake application pressure. The brake cylinder is where the application of air pressure directly acts to apply the brakes. Therefore, this pressure can also dissipate more quickly at this point due to various reasons, such as minor leaks that might be present in the system or less resistance to change in pressure.

In the brake cylinder, the air pressure is responsible for holding the brakes in the applied position. If the pressure in the brake line is not maintained, the pressure at the cylinder can decrease, allowing the brakes to release slightly or "creep off." This is particularly evident when the car is not actively being monitored or when the brake line pressure is not kept at an adequate level, leading to a quicker reduction of force at the cylinder.

In contrast, other components like the brake line, air compressor, and control panel do not directly engage with the mechanics of brake application in the same immediate way. The brake line serves as a conduit for pressure but does not experience the same rapid rate of change in terms of brake release as the brake cylinder would. The air compressor's role is to supply air pressure but it