You obviously haven't been listening. We could go on about the smell of burning coal, the clank of the connecting rods, the merry chatter of enthralled passengers, etc., but you wouldn't be convinced, we know.
Just say it's in the blood. We have to do it, and that's an end to it.
While you're contemplating the above wisdom, here are a few links to help broaden the view (and a few more), plus a new-fangled blog-thing recording the intimate lives of certain railway modellers, the names of the senior management responsible and a list of the webmaster's many creditors.