What is indicated by the presence of a distant signal?

The presence of a distant signal specifically indicates that a train is approaching a block signal. This type of signal serves as a warning to the crew that they need to prepare for the upcoming block signal and be aware of the status of that signal—whether it will be clear, approach, or stop. Distant signals provide critical information that helps the train crew maintain safe speeds and make appropriate operational decisions as they approach these signals. This ensures that the train can safely navigate the upcoming sections of track, avoiding potential hazards and operating within the parameters set by the signaling system.

Other potential options related to track conditions, stopping requirements, or weather conditions are not the primary purpose of distant signals. While these factors may affect train operations, they do not represent the specific function of a distant signal in terms of providing immediate instructions related to approaching block signals.