What does the term "marker" refer to in train signaling?

The term "marker" in train signaling refers to a non-signaling indication used primarily for providing information to train operators. Markers can serve various purposes, such as identifying specific points along the track or providing visual cues to help guide movements, particularly in areas where traditional signals may not be present. They assist train operators by denoting boundaries or specific locations without providing a formal signal, which can improve situational awareness and safety.

Markers are important for conveying information in contexts where more formal signaling may not be necessary or available. They do not directly instruct trains to stop, proceed, or slow down; instead, they support operational awareness and guidance. This clarity in identifying what a marker represents and its function is crucial for train operators to safely navigate their routes and understand their surroundings effectively.