Hi James, now this issue which I am about to talk about has been long standing since the release of the British 0.9.2 Pakset. The signals in game whenever the train is approaching a non-terminus stop (example: the one in the picture) clear to a double yellow (four aspect signalling) and clear (three aspect signalling) rather than clearing to a single yellow (unless the section ahead after the next signal is clear (so the signal at the station is a single yellow). Here is a picture below of proof that this happens to a four aspect signal.
(http://simutrans-germany.com/files/upload/simscr139.png)
Can you upload a saved game in which this issue can reliably be reproduced?
Yes I can and here it is: https://drive.google.com/open?id=0Bzy63vjRdV2_SFVmZy03YmhUeDA (https://drive.google.com/open?id=0Bzy63vjRdV2_SFVmZy03YmhUeDA)
Thank you for the report. I think that I have now found and fixed this, which fix should be available in to-morrow's nightly release.
:D