What does Form D line 2 in both directions allow a train to do?

Form D line 2 specifically permits a train to operate in either direction on a particular track segment while ensuring that the occupancy is exclusive to that train. This means that when a train is authorized under this form, it has the exclusive right to occupy that track section in both directions, which is crucial for maintaining safety and preventing any potential collisions with other trains that may be using the same track.

The designation of exclusive occupancy ensures that the train can proceed without interference from other train movements, which is essential in maintaining operational efficiency and safety. This allows for flexibility in train operations, as trains can move forward or backward as needed without being constrained to a single direction.

The other options do not accurately reflect the capabilities granted by Form D line 2, as they suggest limitations or permissions that do not apply in this context. For instance, operating in one direction only restricts the flexibility offered by the Form D line 2, while performing additional stops at stations does not relate to the purpose of this authority. Additionally, only entering the track with permission does not capture the exclusive nature of occupancy granted by this specific authorization.