What happens when the automatic brake valve is moved to the release position?

When the automatic brake valve is moved to the release position, it facilitates a process that increases the pressure in the equalizing reservoir. This occurs because moving the valve to release allows compressed air to flow from the auxiliary reservoir to the brake cylinder and effectively releases the brakes.

This action not only contributes to the equalization of pressure across the system, allowing the train to return to a state where it can operate normally without brake application, but it also enables the release of the pressure holding the brakes in place. Thus, the correct understanding of this mechanism is vital for effective train handling and ensuring the safe operation of the trains.

Although other options may seem relevant, they do not accurately reflect the primary function of the valve's release position as effectively as the increase in equalizing reservoir pressure.