Before permitting a reverse movement that goes against the current of traffic, what must the Dispatcher ensure?

Before permitting a reverse movement that goes against the current of traffic, it is crucial for the Dispatcher to ensure that the track is clear of opposing moves. This safety measure is essential to prevent potential collisions or accidents. The Dispatcher must verify that no trains or other equipment are occupying the track section in the opposite direction to guarantee safe passage.

Ensuring the track is clear minimizes the risk of interactions between trains traveling in opposing directions, safeguarding both personnel and equipment. While other options may involve important considerations as well, confirming the track's status is the primary concern in this scenario to maintain operational safety.