Willie,
Apsberger's (sp?) is pretty widespread. Lot of computer geeks have it to one extent or another. People who have it are often quite intelligent, but they are shockingly lacking in social skills. It doesn't mean they can't function in society, just that they come across as weird. If it's what this guy has, he has a very severe case.
Been hitting the books on it for a while; it's a tentative diagnosis of a young nephew of mine.
Most sufferers don't have a problem keeping their obsession at least, if not under control, within the bounds of legality.
The wife sounds like an immigrant's marriage of convenience. I was surprized to find out from a Fed buddy that they have no compunction at all about declaring a marriage a sham, getting a judge to nullify it, and deporting people (they don't look for sham marriages, but they often stumble across them while investigating serious crimes). I hope I am wrong about this, and it's just true love between a weirdo obsessed with trains and a middle-aged woman who happens to be foreign.
d.o.l.
Criminal Number 18F
I've never heard of the specific terms "Asperger" or "little professor" syndrome before.
But over the years, I've certainly known people who display the symptoms.
Usually harmless, but excessively focused obsession that's unproductive.