If a track warrant is canceled because the track becomes unavailable, what must the train do?

• A. Stop and await a new or updated warrant.
• B. Continue at reduced speed.
• C. Ignore and proceed.
• D. Notify the crew's supervisor and continue.

Answer: (A)

Movement on a track warrant relies on having valid authorization to occupy the designated section of track. If that authorization is canceled because the track becomes unavailable, the train must stop at the first safe point and wait for a new or updated warrant before resuming. Continuing without a valid warrant or trying to proceed at reduced speed would violate safety rules and could create conflicts with other traffic. Simply notifying a supervisor and continuing does not restore authorization—you need fresh authority to move again.