What device is used to cut the automatic brake valve in or out?

The automatic brake valve cutout valve is the device specifically designed to cut the automatic brake valve in or out. By performing this function, the cutout valve allows for the isolation of the automatic brake system, which can be essential during troubleshooting or when performing certain maintenance tasks. This capability is important for train operations, ensuring that if one part of the braking system fails or needs attention, it can be disengaged without affecting the entire braking functionality of the train.

The other choices serve different functions within the train brake system. The brake valve handle is used to control the application or release of the brakes but does not have the capacity to cut the brake valve in or out. The pressure regulator is responsible for maintaining the correct pressure levels within the brake system, contributing to consistent braking performance, rather than isolating parts of the system. The emergency brake valve is designed to engage an emergency stop for the train, allowing for rapid deceleration, but it does not perform the task of cutting the automatic brake valve in or out.