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Click on the “routes” icon to enable the route display. This will show you that both the forwards and backwards route will try to take the same track. The train on the single track is not planned to switch to the side track.
The reason is that you placed too many signals. Never place a signal where a stopped train would block traffic. More exactly: Never place a signal on the single track side of a switch.
You also placed signals on the two-track side of the switch – also too many. Train fever uses a score system to determine which path to choose – passing a signal in correct direction has a bonus. Passing a signal in opposite direction reduces the score. The route you created will pass one correct and one opposite signal on both tracks, so the AI cannot choose one based on signal scores and will use the shorter track length.
When creating such a passing siding, only ever place ONE signal at both double track ends, and no signal on the single track parts. And check if the route will use both tracks.