When a train passes a signal indication that is less than clear, what must be communicated between crew members in the cab of the controlling locomotive?

• A. The track designation ahead.
• B. The next signal status.
• C. The speed of the train as it passes the signal indication that is less than clear.
• D. The train length behind the signal.

Answer: (C)

When a signal indication is less than clear, the essential piece of information to share is the speed of the train as it passes that signal. Knowing the actual speed at that moment lets the crew judge whether the train is moving within the limits required for a restrictive or caution indication and prepares them to adjust to ensure a safe stop or slow down as the signal clarifies. The other details—track designation ahead, the status of the next signal, or train length behind—don’t provide the immediate, actionable safety context needed at that moment; the speed at passing is the critical factor for coordinating safe operation.