If the cab signal changes between fixed signals, the _____________ signal will govern?

If the cab signal changes between fixed signals, the _____________ signal will govern?

• A. Fixed signal
• B. Speed control signal
• C. Cab signal
• D. Dispatcher signal

Answer: (C)

When the cab signal changes between fixed signals, the cab signal governs. The in-cab indication provides the locomotive with the most current instruction for that block, including permitted speed and proceed/stop status. If the cab shows a different or more restrictive aspect than the trackside fixed signal, you must follow the cab signal because it reflects real-time conditions for the train’s immediate path. The fixed signal governs only entry to the next block and may not reflect changes that the cab has already detected. Dispatcher signals aren’t the automatic controlling authority in this situation, and speed information tied to the cab signaling is part of what the cab conveys, not a separate signal.

When the cab signal changes between fixed signals, the cab signal governs. The in-cab indication provides the locomotive with the most current instruction for that block, including permitted speed and proceed/stop status. If the cab shows a different or more restrictive aspect than the trackside fixed signal, you must follow the cab signal because it reflects real-time conditions for the train’s immediate path. The fixed signal governs only entry to the next block and may not reflect changes that the cab has already detected. Dispatcher signals aren’t the automatic controlling authority in this situation, and speed information tied to the cab signaling is part of what the cab conveys, not a separate signal.