If Transport Fever crashes you can find information about the crash reason in the file stdout.txt.
Please note: If you start Transport Fever again, it will overwrite any old file and the crash reason is lost.
For Steam Users:
<Drive letter>\<... Steamfolder ...>\userdata\<userid>\446800\local\crash_dump\
<Drive letter>\Users\<User Folder>\AppData\Roaming\Transport Fever\crash_dump\