When must a track warrant be extended, renewed, or replaced?

• A. When the original time window is about to expire or when continuing movement beyond the current limits is necessary.
• B. When the train reaches the next station.
• C. At the discretion of the crew.
• D. Only after maintenance completes.

Answer: (A)

Warrants give trains authority to move within a defined time and geographic area. They must be extended, renewed, or replaced whenever the current time window is about to expire or when the movement will continue beyond the current limits. This keeps the authorization valid before the train proceeds past the planned end of the window or outside the designated route. The extension or renewal is a formal communication with the dispatcher, not something the crew does on a whim, and it isn’t tied to reaching a station or to maintenance being completed. Simply arriving at the next station doesn’t automatically renew the warrant; if you’re continuing to move, you need an updated authorization.