Train pathfinding not updating

[GhostPirate]

Apologies if this has been posted, I've searched but there are quite a few posts on trains, and I couldn't find anything quite like this.

Blueprint: https://pastebin.com/ms2gsKEZ

I believe I have identified a train pathfinding bug:
- A train is in a smelting array, but it is empty. It cannot leave due to the next block not being free. Other stations in the smelting array are free.

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- A train is in the mining array, and it is full. It is trying to path to a smelting station.

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Expected behavior:
- Train full of ore will correctly path to an open smelting station.

Actual behavior:
- Train does not path to an open station, instead preferring to sit and wait for the train to leave the first smelting station.

20190729224209_1.jpg (486.95 KiB) Viewed 1259 times

I believe the bug lies in the pathfinding code that relies on time that a train has spent stopped at a signal:

When the path includes a train currently waiting at a rail signal -> Add a penalty of 100 + 0.1 for every tick the train has already waited.

When you place a rail signal somewhere behind the station, such that it is pre-occupied by the train, then everything works as intended.

20190729224311_1.jpg (753.02 KiB) Viewed 1259 times

[Loewchen]

This is working correctly, you need to make all stations equally attractive or build more compact setups to prevent that behaviour. NaB.

[GhostPirate]

I'm pretty sure there is a bug here. I've simplified the train network considerably to demonstrate the behavior.

Blueprint: https://pastebin.com/PngghZ3t

1. A train is waiting at the "Ore Load" station. It wants to go to an Ore Unload station. There are three available: Two are nearby, and one is further away.

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2. The two nearby "Ore Unload" stations are occupied. The train trying to leave the "Ore Load" station is frozen, and will never move.

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3a. Now delete the disconnected "Ore Load" station. Now the train moves.

20190730233133_1.jpg (614.04 KiB) Viewed 1206 times

3b. Re-place that station, and instead connect the broken curve. The train will path to that station, despite only being 2 tiles closer.

20190730233140_1.jpg (658.84 KiB) Viewed 1206 times

Save attached.