If a track warrant restricts movement of previously granted authority, it cannot be considered in effect by the train dispatcher until __.

• A. The OK time has been acknowledged
• B. The dispatcher signs off
• C. The train passes the point
• D. The track is inspected

Answer: (C)

The situation hinges on when a new track warrant that restricts movement of trains with existing authority becomes enforceable. If the warrant would limit trains that already have authorization, you don’t apply that restriction while the train is still approaching or within the affected area. Instead, the restriction becomes in effect only after the train has passed the designated boundary point. This ensures the train isn’t forced to react to a new restriction mid-block or while it’s still occupying the space, which could create unsafe conflicts. Once the train has cleared that point, the dispatcher can enforce the new restriction for following movements.

The other options don’t determine when the restriction takes effect: acknowledging an OK time, the dispatcher signing off, or an inspection are not the triggers for when a restriction on previously granted authority becomes active.