What does a blue light signify for a train operator?

A blue light signifies the location of an emergency alarm box for a train operator. These emergency alarm boxes are essential safety features along the railway, enabling immediate communication with train control in case of an emergency. The blue light helps train operators quickly identify these critical equipment points, ensuring that they can respond promptly if an incident occurs. This designation for emergency boxes is standardized to maintain consistency and clarity for train operators during their routes.

In contrast, other colors and signals are designated to represent different meanings; for example, colors like yellow might indicate speeds or signal aspects, while green could signify other important information such as the presence of a station or safe passage. Thus, understanding the specific meanings attributed to different colored lights is crucial for maintaining safety and operational efficiency in train operations.