The only Trainz I bought was 2004. Everthing was great except for one major flaw that made the game rather unplayable: a lousy AI that couldn't follow path instructions:'( . I haven't bought any Trainz since. So, is the AI any better in 12? Sometimes I like to sit back and let the game run itself, like a computerized model train layout. The AI needs to be "smart" to do this.