What would you do if you met a beautiful girl on the train? And she's right across from you?

Take the initiative to strike up a conversation, but not too abruptly and be subtle. Play it by ear. For example, help her carry and store her luggage. Smile kindly after a little effort, and do your own thing calmly with an inadvertent glance. Someone who is personable will definitely catch her attention. Let her take the initiative to talk to you. But you must talk humorously to make her love to communicate with you