There was a brief period of time when I was reading the Dark Tower series by Stephen King where I was obsessed with Blaine the Mono (though no other trains, and mostly because he liked riddles and so did I, not because he was a train), does that count? If not, then I am once again in what seems to be the minority, an Aspie who has never had the slightest interest in trains of any kind or in any other forms of transportation. My thing when I was younger was insects and other arthropods, and also reading any scary story I could get my hands on.
_________________
Yet in my new wildness and freedom I almost welcome the bitterness of alienage. For although nepenthe has calmed me, I know always that I am an outsider; a stranger in this century and among those who are still men.
-H. P. Lovecraft, "The Outsider"