I come across this frequently, where a train can make a specific turn, but the pathfinder is seemingly taking the first one it can find, and ignoring the blatantly obvious clear path a single tile later on.
Orange: The route the train was trying to take, but wasn't able to due to the sticking out train
Green: the route it could have taken to bypass the block.
After I removed the segment of track that it was trying to take on the orange line, it happily went "oh duh!" and took the green route. Is there any way of getting the pathfinder to avoid this?
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Oh, and yes, I know this is really bad junction design. It was made with the signal far enough back the longest train wouldn't stick out and block the entire junction, turns out ti does, because the pathfinder appears to find the first sane route and go "nooope". I have removed the segment of track the orange route was taking, but it'd be nice to not need to remeber to this. Pathfinder selected is YAPF