When can the Dispatcher re-authorize an occupancy of the track?

The correct answer is based on the principle that a Dispatcher can re-authorize an occupancy of the track once proper authority is confirmed. This is integral to maintaining safety and communication protocols within the railway operation. Proper authority ensures that all necessary checks have been completed and that the track is clear of any conflicting movements. This confirmation often includes verifying that the previous occupancy has been cleared and that any necessary authorizations, such as signals or indications, are in place to safely allow a new train or equipment to occupy the track.

The other choices, while they may reflect situations related to train movements, do not capture the necessary procedural requirements for re-authorizing occupancy. Simply stating that all equipment has left the track or a crew's request does not guarantee the safety or operational readiness for the next occupancy. Likewise, the time of day, such as during regular operating hours, is irrelevant without the confirmation of authority, which is the critical factor in this operational procedure.