"Entering Single Distant Territory"Board On Signal Post of Mantralayam Road Outer Signal Near Sleeper production Factory.
About Distant Signals : A distant signal (also known as a pre-warner) indicates approach to a more restrictive signal further ahead. In IR terminology, the distant is said to 'pre-warn' the driver of the indication of the next signal ahead. Examples: The distant signal shows Caution, and the next stop signal ahead is at Stop. Or, the distant signal shows Attention, and the next stop signal is at Caution.
A distant signal may be at Attention...
more... if the following signals guard a divergence and the points there are set for a route other than the main line. A distant signal to the rear of signals at a divergence will be at Proceed if the points are set for the main line at the divergence. In that case, the stop signal for the main line may be at Caution. Of course, both the distant and the next stop signal may be at Proceed.
A distant signal is a permissive signal and may always be passed even in its most restrictive indication. A distant signal is analogous to a distant signal that occurs by itself in UK practice. A distant signal is typically at a distance of 1km or so from the stop signal it protects, but this may vary depending on the particular track requirements.