When given a box 3, Work Between, what does the Track Authority form indicate?

The correct answer highlights that the Track Authority form specifies the direction of the train's movement when a box indicates "3, Work Between." This means that the train is given permission to operate within a designated area under specific conditions, which often requires adherence to certain operational guidelines based on the indicated track segments. By clearly indicating the direction, it ensures safety and clarity for train crews, as they must be aware of where they are permitted to travel based on current track conditions and operational requirements. This is essential for effective communication amongst train engineers and signalers, ensuring that the train operates within the safe and designated parameters.