Approaching Semaphore Advance Starters

[Wilkinstown]

A quick question. In what circumstances can a train be allowed approach a semaphore advance starting signal controlling entry to an occupied absolute block section ? Is it sufficient for the line to be clear 440 yards in advance ?

[John Hinson]

It really doesn't matter if the line ahead of said signal is clear for 1 yard or 440 yards - any train drawing up to such a signal will have been brought nearly to a stand at the previous signals controlled by the same box.

The 440 yard clearing point (or whatever it is currently) is only pertinent to accepting trains through the block section.

John

[Wilkinstown]

In many instances it would have been common to have a track circuit extending from the previous signal up to a point beyond the advance starter especially where this signal was not visible from the signal box.