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Messages - fredp
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Simutrans Help Center / Signalling question
I have this layout:

I have a suburban line arriving from A1, heading to S3 through the single track (red) and then going back to A2.
Interregional trains instead travel A1->B1 and B2->A2 stopping at S1 and some also at S3.
My problem is avoinding trains to get stuck on the single track between S1 and S3: this happens for example if a trains traverls to S3 when the two platforms are busy.
Which signals should I use?
Consider please that for space reasons I cannot add another platform to S2.
Thank you very much.