During a service brake application, direct air from the auxiliary reservoir goes into which part of the brake system?

During a service brake application, direct air from the auxiliary reservoir goes into the brake cylinder. This process is essential for activating the braking mechanism of the train. When the engineer applies the brakes, the control valve allows air to flow from the auxiliary reservoir into the brake cylinder. This increase in air pressure inside the brake cylinder causes the brake shoes to press against the wheel, producing the necessary friction to slow down or stop the train.

The correct functioning of this process is vital for effective train operation, as it allows for controlled and gradual braking, which is important for ensuring the safety and stability of the train while it is in motion. This mechanism is different from the functions of the emergency reservoir or equalizing reservoir, which handle air differently in various braking situations. The control valve acts as the regulator that directs air flow but does not serve as the point where auxiliary air is applied to slow the train.