I don't store my games on my C drive. The AppData files on C drive do not show Transport fever 2 files of any kind. I've looked in every folder, ran a system wide search on all my drives, made sure myself that the other drive (G,) where I store all my games, there is no 1066780\local\crash_dump\ anywhere.
c:\Programme (x86)\Steam\userdata\<your steam userid>\1066780\local\crash_dump\ does not apply to me, I've set my G drive to hold everything.
I have hundreds of games, about 50 of them currently loaded on to my G drive. Never had an issue like this.