How can a Dispatcher end a Form D line 2 in both directions?

Ending a Form D line 2 in both directions necessitates the appropriate protocol for cancellation. When a dispatcher needs to conclude a Form D, it must be explicitly cancelled to ensure that all relevant parties are aware that the authority no longer applies. This cancellation process is critical for maintaining safe operations and preventing any confusion about the current state of permissions on the tracks.

A seamless cancellation provides clarity and safety by indicating that the previously issued authority is no longer valid. The dispatcher must communicate this cancellation effectively to all concerned parties, especially the train crews affected by the Form D, to ensure that they understand they no longer have that specific authority on the track.

The other options do not adequately address the necessity of formally cancelling the Form D to ensure safety and operational integrity. Simply issuing a new Form D line 1 could create confusion instead of clarity, while contacting the crew directly does not fulfill the need for documented cancellation. Additionally, switching the track to normal does not provide assurance of formally rescinding the authority granted by the Form D. The only thorough and clear method to terminate a Form D line 2 in both directions is through a cancellation process.