What must be done to enable doors that have been closed during a restriction?

To enable doors that have been closed during a restriction, switching to the Cut-Out position of the Automatic Train Control (ATC) Door Mode is the correct action. This mode allows the operator to manually control the doors, overriding the restrictions that have been placed on them.

When the Cut-Out position is engaged, it disables the automatic restrictions that were previously applied, granting the operator the ability to open the doors as needed. This is particularly important in scenarios where the automatic systems may prevent door operation due to safety protocols or operational constraints.

Other options might involve procedural protocols, such as contacting personnel or waiting for instructions, which could delay necessary actions. Engaging the emergency stop is intended for situations requiring an immediate halt to train operations for safety, rather than specifically addressing the state of the doors.