wrote in message
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I noticed at Canonbury that the signal at the east end of the westbound
track on the NLL is always indicating a double yellow, even though trains
are coming in from the east. Why is that?

Track 4 of Dalston Junction also has a northbound signal that always
indicates single yellow.

I'm pretty sure the above features are because much of the signalling is
bidirectional. Something said in uk.railway a while ago reported that the
aspects displayed for the wrong direction movements don't just show
permanent reds until a train happens along.

Also on track 4 at Dalston Junction, there appears to be a diverging ROW
that looks like it is headed east. Does anybody know what that is for? Is
this to stable trains in the future or for eventual eastbound turnout onto
the NLL? IMHO, that it looks like that would be for prospective service
movements, rather than for revenue.

It is definitely future proofing to allow a future single track South to
East curve, but as you suggest it doesn't seem to allow for a regular
service, there'd probably be two many crossing conflicts (at the DJ throat
and also on the NLL at a potential eastern junction) to timetable a regular
service.

Paul S