Fine, if my normal advice of "smile and just speak" is not an option for you, then we'll have to think of something else.
Here's my suggestion: Follow him. Where precisely do he go when he gets off the train? To a job? To school? Once you find out where he goes, see if you know anyone there. If you do, ask these people about who he is, if he's single, and what he likes. Then craft a persona that would appeal to this guy. Wearing your new persona, follow him again and then insert yourself into his day somehow. Get into his class or his office. Then make your move.
Does that plan sound weird, stalkerish and a lot of work? Don't want to do all of it?
Well, how about you smile and just speak to him.
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