How must the dispatcher validate the track warrant after it is repeated?

The dispatcher validates the track warrant after it is repeated by stating the "Authority" number followed by "OK." This confirmation serves as an official acknowledgment that the repeated information is correct and that the authority for the train's movements is in effect. The phrase "Authority number OK" is a critical step, ensuring that all parties involved have a mutual understanding of the track warrant's validity.

This process is essential for maintaining safety and operational efficiency on the railroad, as it helps prevent misunderstandings or miscommunications between train crews and dispatchers regarding train movements, track usage, and specific instructions. By stating this explicit confirmation, the dispatcher reinforces clarity and accountability in the communication process.