What is the 'train horn' signal used for?

The train horn signal serves an essential safety function by alerting pedestrians, vehicles, and workers of an approaching train. This auditory warning is critical in preventing accidents and ensuring that individuals in the vicinity are aware of the train's presence, especially in areas where visibility may be limited or where people might be focused on tasks and not paying attention to their surroundings. The loud sound of the horn is designed to travel over long distances and penetrate ambient noise, making it an effective way to communicate the train's approach.

Other options do not align with the primary purpose of the train horn. For instance, using the horn for entertainment or indicating a train's stopping would not address the core safety concerns, while signaling the end of a work shift is unrelated to the function of the train horn. Understanding the purpose of the train horn underscores its role in enhancing safety in train operations and surrounding areas.