Within CTC territory, what must occur when a train is delayed in a block and another train needs to enter?

In CTC (Centralized Traffic Control) territory, safety and efficient management of train movements are paramount. When a train is delayed within a block and another train needs to enter that block, both trains must be given joint track and time. This procedure ensures that both trains are aware of the occupied block and can communicate any necessary movements or adjustments.

By providing joint track and time, both train crews are notified and acknowledge the situation, maintaining safety while allowing for the necessary coordination. This practice prevents potential accidents or miscommunications that could arise if one train were to proceed without awareness of the other's status.

The other options imply a prioritization or unilateral action that could compromise safety. It's crucial that both trains are accounted for in this scenario to uphold the operational standards of the railway.