User blog comment:Lightening McQueen/Cars 3 Possibility/@comment-1749469-20120806050840/@comment-3438245-20120816182731

Yeah, steam trains would be a very, very tricky thing to put in the Cars world....

But I'm pretty sure they'll have to put the eyes in a windshield of some kind, it's one of the basic rules of the Cars world. While that works great on cars, planes, trucks, and small boats, it's a real problem on big boats and steam trains, that have "windshields" far away from the front end... Yet all boats that have appeared until now did have their eyes in the windshield and the mouth at the front anyway. So the same might happen with trains...