Which color is typically associated with a stop signal?

The color red is universally recognized as the signal for "stop" in various contexts, including traffic signals and railway operations. This standardization is crucial for safety, as it allows locomotive engineers and operators to quickly and effectively respond to stop signals. When a red signal is displayed, it indicates that the engineer must bring the train to a complete stop to prevent accidents and ensure the safe passage of other trains or vehicles on the tracks.

In contrast, the other colors listed have distinct meanings: green typically indicates that it is safe to proceed, yellow suggests caution or that a signal may change soon, and blue is often used for other types of informational signals. Recognizing the role of each color in the signaling system is essential for the safety and efficiency of train operations.