Train Girl

Okay. Hypothetical situation for the girls:

Say you regularly travelled on a train on the way home from work or whatever. You repeatedly acknowledge (i.e. don't check out, don't give any thought to) a guy who happens to share your way home - all the way to your house which is in fact two doors away. Let me make it clear that you're indifferent about this fact.

What would be the best way for him to approach you without causing you any offence or distress? Further, what would be the best way for him to approach you that results in a positive outcome? We're not talking "pulling" (urgh) here, if anything a positive result would be a complimentary friendship - they are neighbours after all.

Well? How? Suggestions on a postcard, please.