<human>: Can you condense the text into a few key points?

(Rant and question in one! Also, wasn't primarily eye contact...)

What exactly are you meant to do in these situations? I seem to mostly make serious eye contact and get signals from girls as I'm leaving trains on a busy day!

It was actually on a quiet train as we were both getting off. Caught her with the corner of my eye as I was about to get up. Kinda looked at me, started brushing her hair away from her face, fake coughing/clearing her throat. Then as I got up I let her go ahead of me, smiled at her, then she gave me this big smile, said 'thanks' in a really quiet voice, looked away, and scoooted off the train quick time. 

What the fuck am I to do in that situation? It's like I've got to order some fucking business cards with my name and number on or some shit.

'Hey, you dropped this! (Hands business card) Thank me later! ;)'

Man this shit is getting frustrating. Any tips for these situations?
<bot>: Made serious eye contact with a really pretty girl as I was leaving the train, showed a load of signs of being into me, felt a strong connection, change over times and her being introverted fucked me over...