What is the primary purpose of a distant signal?

The primary purpose of a distant signal is to indicate the approach to another signal. Distant signals are strategically placed to provide advance warning to train crews about the status of the upcoming main signal. This early indication allows the crew to prepare for the need to stop or adjust their speed, aiding in safe and efficient train operations.

While governing train speed and marking the end of a block section are important aspects of railway operations, those functions are typically associated with different signal types or markers. Weather conditions may be displayed through separate systems, but the distant signal's main role revolves around communication about the state of the signal that is ahead, allowing for better decision-making as the train approaches.