Who knows, he could have been into numerology. I've really been pondering this hard today, and looked and re-looked at the only CCTV footage moving shots I can see.
http://www.theage.com.au/victoria/killed-by-a-train-and-no-one-knows-who-he-is-20121008-278ba.html
I agree he's definitely a traveller from overseas, due to both his top and jeans being European, and he was wearing them. If they were ultra good clothes to him, he'd treasure them.
He is eating at homeless free food outlets, but he has a very recent hair cut - like in the past 2 weeks I'd say.
He has had money in the past, but not now.
His face looks a bit like he has bruising on it, especially his nose and the right hand temple area looks shaded or bruised.
We are told he has pale skin, indicative of being in winter climates away from the sun for some time. So I'd be thinking he came from a country that was in winter, before he got to Australia. Or, he'd been in the southern states of Australia the whole winter. If he'd worked on the snowfields he'd be wind burnt, so he would be quite tanned. So I'm ruling that out.
I don't think he has Asperger's for two reasons, on the moving shots in the video, his head movements are quick, but smooth, not jerky. He's also in touch with a lot of emotion on the train.
With the pic of him on the train, it looks a bit like he's holding a mobile phone in his right hand and holding it up to his right ear and talking to someone on it. In that case he knows someone in Australia, or had an overseas phone call ... maybe bad news ... the gf or bf broke off their relationship. Or he was asking his folks for money and they said "no". I don't see parents saying this, especially since he had such nice expensive clothes.
Why did he remove all his ID before committing suicide? Either it was because he was super pissed off with them and committing suicide because he was angry with them, but I doubt that. The ultimate act of anger against them would be for them to find out. Now maybe they belong to some religion where it would bring enormous humiliation, apart from the obvious pain of his death, to know that he suicided. Maybe a previous family member suicided and he gathered this from their reaction to it. So if he killed himself and tries to ensure they'll never find out, by removing all his ID, then that way they don't live in shame of him committing suicide.
I just wonder whether with his family's religion, they believe if you commit suicide your going to hell. So if that was the case, what religion might he be? I'm not sure myself. Although just did some reading that said Catholics believe that. So which Eastern European countries that sell Alvine brand and the other brand Jeans, and are in Winter before he got to Australia?
The other possibility is he got the haircut to conceal who he was. Maybe his hair is normally quite long. Maybe he has a beard normally.
In the video footage of him, he's holding what looks to be a newspaper under his arm. I just don't see someone with low functioning autism reading a daily newspaper.
Maybe by riding the train to Williamstown (did he just travel to Williamstown? or did he get on the train at Williamstown?) anyway, was he looking for a suitably quiet station to commit suicide from, one where there would be no people there to stop him. Williamstown station has a lot of people around, most of the time. Same with Belgrave, because of Puffing Billy, the steam train leaving from there. East Camberwell is quiet, the quietest on that route. Most people hop off at Camberwell, or go further to Surry Hills or Box Hill station. So maybe he checked out the Williamstown train line and decided that was no go to commit suicide from there.