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Here are the steps that I experienced :

I built a station
I put ghost of blueprint to connect the new station to my main station, robots started to build the rails
I put a train on my new station
I set it's orders (the first is to wait until full)
The train is full, but there is not path so it can't move: robots didn't finished to build rails
Robots finished to build rails
The train still said "No path found"
I opened the train interface and clicked on "Go to the station"
It started successfully

It seems that the train doesn't search a path each time before saying that there is not.

fochristo wrote:Here are the steps that I experienced :

I built a station
I put ghost of blueprint to connect the new station to my main station, robots started to build the rails
I put a train on my new station
I set it's orders (the first is to wait until full)
The train is full, but there is not path so it can't move: robots didn't finished to build rails
Robots finished to build rails
The train still said "No path found"
I opened the train interface and clicked on "Go to the station"
It started successfully

It seems that the train doesn't search a path each time before saying that there is not.

Thanks for the report,

I cannot reproduce the issue,
Can you provide a screenshot of a better setup for to find this issue:

I also did not succeed in reproducing the bug :/

You can close this thread. If I see this bug again I'll try to save more informations about it.
Thanks for trying to reproduce !