How are changes to a track warrant communicated when the train is already en route?

• A. The crew must stop and re-enter all warrants at the next station stop.
• B. Changes are posted on a bulletin board at the yard office.
• C. The dispatcher issues a revised warrant or an amendment and the crew acknowledges and implements the changes.
• D. The train can continue on the current warrant until the next confirmation is received.

Answer: (C)

When a track warrant needs changing while the train is already en route, the dispatcher issues a revised warrant or an amendment and the crew acknowledges receipt and implements the changes. This real-time update ensures the train operates under the current authority and can adjust limits, speeds, or routes immediately as needed. Posting notices at a yard office or continuing on the old warrant without acknowledgment would not provide timely, authoritative guidance and could create conflicts with other movements. The important part is that the crew not only receives the update but also confirms it and adjusts their actions accordingly, usually via radio communication.