When I try download game from server it fails after few MB downloaded. I found that download link redirect to urls like http://eu2.factorio.com/releases/* I changed this url to https and only than downloaded successfully. I tried this few times, http always fails, https always work.

He said himself it can't happen on its own. This is only possible if your train is manually stopped or runs out of fuel in the middle of your intersection, AND is told to basically do a U-Turn (in this instance go South). Because of the trains length its occupying 2 blocks, which is blocking itself ...