What are flags and torpedoes used for in train operations?

Flags and torpedoes are essential safety tools used in train operations to communicate warnings regarding hazards or track restrictions. When train personnel need to alert incoming trains about potential dangers on the tracks—such as obstructions, track defects, or work zones—these signals are utilized prominently.

Flags serve as visual indicators that can be seen at a distance, while torpedoes are explosive devices placed on the tracks; when a train rolls over them, they create a loud sound that alerts the crew of an approaching train to the need for caution. This dual approach ensures that train operators are well-informed about any issues that might compromise safety, thus preventing accidents and ensuring the smooth operation of rail services.

The other options do not accurately reflect the role of flags and torpedoes, as they are not used for refueling, guiding tourists, or serving decorative purposes. Their functionality strictly revolves around safety and hazard communication within the railway environment.