Factorio Forums

So as you can see the Ore-Train in the picture decided to try to enter an already occupied spot in the train buffer, while there are enough parking areas, thereby jamming the whole trainsystem.
It seems to happen very randomly. Maybe this happens because they plan their route very far ahead and than stick with their plan.

I can confirm this. Happened to me several times in my test-map where I test my train blueprints.
It stopped occuring after a while but I dont know why.

That's not a bug. Not really desired but there's no rule that says trains can't try to path over rails already used by other trains. It's likely what you described happened: one of those two trains pathed to that line and while the other was on-route one of them re-pathed and got the same stacker section - which is perfectly valid.

You need to put a chain signal at the entry to your stacker so the train doesn't enter unless it can go properly into the stacker system.

I heard trains are checking their path now every 5 seconds instead of 30s as it was before. How do they not repath then?

Distelzombie wrote:I heard trains are checking their path now every 5 seconds instead of 30s as it was before. How do they not repath then?

They try to re-path every 5 seconds if they're stopped at a chain signal and the train stop destination exists more than one time.