What type of signal is a yellow lantern considered in train operations?

A yellow lantern is classified as a warning signal in train operations. This type of signal is typically used to indicate a cautionary status to train operators, informing them that they should prepare to stop or reduce speed because they may encounter a hazard or restriction ahead. Warning signals are critical for safe train operation as they convey important information without being permanently installed like fixed signals.

In contrast, fixed signals are stationary and provide consistent indications for train movements, while temporary signals may be used for specific situations, such as work zones or track maintenance. Since a yellow lantern is not a permanent installation and is used to indicate a warning status, it aligns well with the characteristics of non-fixed signals. Thus, the accurate classification reinforces the understanding of signal types and their functions in ensuring safe train operations.