What does the Dispatcher need to cancel for a disabled train in DCS territory?

In the context of a disabled train operating within DCS (Dispatcher Controlled Signaling) territory, the Dispatcher is responsible for managing and communicating the status and movements of trains to ensure safety and efficiency. When a train becomes disabled, particular attention must be given to how its current authority is handled.

In this scenario, the Dispatcher needs to cancel Form D line 2. Form D line 2 is utilized to grant authority to a train to occupy a specific segment of track. When a train is disabled, it is essential to cancel this authority to prevent any further movements that could lead to collisions or unsafe conditions. By canceling Form D line 2, the Dispatcher effectively removes the authority to occupy the track segment, ensuring that other trains are not permitted to enter the area where the disabled train is located.

The other options relate to various forms of authorities and permits that might not be specifically relevant to a disabled train in this context. Therefore, only the cancellation of Form D line 2 is necessary to maintain safe operations in light of the circumstances surrounding the disabled train.