A Mars light is a type of rotating warning light used on trains to signal their approach. It is named after its inventor, and its unique rotating movement creates a bright, sweeping light that makes the train more visible, especially in poor weather or low visibility conditions. The Mars light is typically mounted at the front of a train and helps to alert other trains, vehicles, or pedestrians about the train's presence. It is often used on certain types of trains, such as those operating in areas with heavy traffic or hazardous conditions, to improve safety.

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