If a sign is non-illuminated and shows a specific meaning, what could it likely indicate?

The interpretation of a non-illuminated sign is crucial for train operators, as it conveys important information regarding the train's operation. In this context, a non-illuminated sign that indicates "Coast" signifies that the train should maintain its current speed without applying power, typically allowing the train to glide smoothly along the tracks. This is particularly relevant when entering sections of the track where speed needs to be maintained without acceleration, thus indicating a sense of energy conservation and safety.

The other options pertain to different operational protocols. "End of block signaling" usually refers to a change in signaling which may necessitate a speed adjustment or stop, rather than indicating coasting. "Normal speed allowed" would typically be indicated through illuminated signals that affirm safe operational speeds, whereas "Stop for inspection" entails a more explicit command for the operator to halt the train, likely marked by prominent and illuminated signage to alert the crew effectively.