Just want to say thanks everyone for all the info. I've been reading this subreddit for months. But just didn't have the courage to do my first approach.

Then someone said yesterday - what's the harm? What's the worse thing that can happen?

So I just walked up to a girl on the train platform this morning. Said hi. I think you look very nice. Love how English you look. She was really please. Really made her day.

I'm going to keep trying. Thanks everyone!